[GUIDE] Unlock/Root/Flash for Nexus 5X

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grabber5.0

Senior Member
Mar 14, 2015
112
27
Samsung Galaxy S21
Well let's start with the basics, which partitions are you backing up in TWRP? Which version of TWRP are you using? Which Android version are you using for these backups?

I've only ever checked boot, data, and system for TWRP backups. I don't backup anything else but I do flash vendor images when reverting to a backup from a previous month.

Sent from my Nexus 5X using Tapatalk

I don't remember all of the details, but here's what I can recall right now. I confirmed yesterday I definitely had the latest version of TWRP at the time, and in fact I think it is still the latest. According to backup log, it was TWRP 3.2.1-0-2af13795.

I generally back up everything I think I might need on the first backup, even if I think I'll never use it. The 5X is the first phone I've had that has the vendor and vendor partitions, so I was initially unsure what to backup and restore. The first backup was a backup of stock Android 8.1 (OPM3171019014 according to TWRP log. Backup date was 3-4-2018, so probably Feb security patch) before I flashed Lineage. Then I flashed Lineage 15.1, used it for a month or so (including an update or two), and then because of a bug I'll post in that thread, and decided to restore the backup. I don't remember exactly what I restored, but I think it was boot, system, and data, as you mentioned. Upon reboot, it was stuck on the Google boot logo. I thought maybe I missed something, so I flashed the factory image and then restored the backup again with the same result. At that point, to rule out any conflicts between the Android, bootloader, vendor image, etc versions, after flashing stock Android and TWRP, I did a backup and then immediately restored it before rebooting. Same result. I don't remember if I tried restoring any partitions individually, as at this time I gave up for a while because of the Lineage bug still affecting me. Plus every time you factory reset, a new device ID is generated, and I had several spots taken up in Google Play Music for the 5X by then and I'm near maxing out the device limit.

I believe I also tried to restore a Lineage backup too - lineage_bullhead-userdebug_810_OPM217101902 based on TWRP backup name.

Edit: I just found the 5X TWRP thread.. Perhaps I should post this there and link to it?
 
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morrisonsvoodoo

New member
Oct 5, 2018
2
0
How can i be able to unlock the oem when it says "oem unlock is not allowed", and my phone is in a bootloop, i cant even access recovery mode.
 

Aimless Rambler

Senior Member
Mar 9, 2012
358
128
Nexus 6
Google Pixel 3 XL
Last edited:

nookin

Senior Member
Mar 24, 2012
258
11
I have a 5X that is bootlooping. I managed to unlock the bootloader. I tried applying some bootloop fix but it didn't fix it. I am thinking of flashing to a factory image. I've downloaded the opm zip. I have a few question:

1. There is a flash-all.bat script. I guess I can just run it instead?
2. Since I am having bootloop issue. Would it stop half-way during flash?
3. Is there a preferred factory image + workaround combination for those experiencing bootloop?
4. Does it matter what model I have? I believe I have H791.
 

vinnybear69

New member
Dec 27, 2018
2
0
no PC connection in bootloader mode

Hi, I have a bullead LGH790 Nexus 5x
Bootloader version BHZ31B
I'm trying to root it but can't get ADB or Fastboot or Nexus Root to see the phone when it is in bootloader mode.
I can see the phone when it is normal mode but not in bootloader
please help
 

CLPose

Senior Member
Jan 7, 2015
726
380
Buenos Aires
Hi, I have a bullead LGH790 Nexus 5x
Bootloader version BHZ31B
I'm trying to root it but can't get ADB or Fastboot or Nexus Root to see the phone when it is in bootloader mode.
I can see the phone when it is normal mode but not in bootloader
please help
It seems as you're having a fastboot driver problem. Did you see the first post? In the "Prerequisites" part, you'll find a link to the necessary drivers. Good luck!
 

CongestedHangman

Senior Member
Jan 27, 2015
293
45
hi. currently i'm on a custom rom. i have unlocked bootloader & latest TWRP.
i wanted to flash stock rom by following this guide.
i've downloaded the last Oreo 8.1 bullhead-opm7.181205.001-factory-5f189d84.zip factory image released for Nexus 5x
uncompressed the whole zip file and got the following .img files

android-info.txt
boot.img
bootloader-bullhead-bhz32c.img
radio-bullhead-m8994f-2.6.42.5.03.img
recovery.img
system.img
vendor.img


there was no cache.img and userdata.img in the zip file.
since i'm on a custom rom, do i need to flash cache.img and userdata.img if i want to go full stock?
 

fvisagie

Senior Member
Nov 14, 2014
117
39
there was no cache.img and userdata.img in the zip file.
since i'm on a custom rom, do i need to flash cache.img and userdata.img if i want to go full stock?

I would imagine so, unless your custom ROM happens to use exact copies of the standard images.

If you need them, posts a while ago mentioned the latest factory image containing the cache & userdata images (if the original post hasn't been updated to mention them yet).
 

Mawth

Senior Member
Dec 11, 2014
84
29
hi. currently i'm on a custom rom. i have unlocked bootloader & latest TWRP.
i wanted to flash stock rom by following this guide.
i've downloaded the last Oreo 8.1 bullhead-opm7.181205.001-factory-5f189d84.zip factory image released for Nexus 5x
uncompressed the whole zip file and got the following .img files

android-info.txt
boot.img
bootloader-bullhead-bhz32c.img
radio-bullhead-m8994f-2.6.42.5.03.img
recovery.img
system.img
vendor.img


there was no cache.img and userdata.img in the zip file.
since i'm on a custom rom, do i need to flash cache.img and userdata.img if i want to go full stock?

Alternatively, you can simply execute the flash-all script located in the factory image .zip. Doing so will return your phone to stock.
Code:
./flash-all.sh
or
Code:
flash-all.bat
depending on which system you are using (unix or windows).
 
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CongestedHangman

Senior Member
Jan 27, 2015
293
45
Alternatively, you can simply execute the flash-all script located in the factory image .zip. Doing so will return your phone to stock.
Code:
./flash-all.sh
or
Code:
flash-all.bat
depending on which system you are using (unix or windows).

thanks for your info...
so, no matter what custom rom/ custom recovery is installed on nexus 5x,
if the flash-all.bat is executed, it will install stock rom without any problem ??
(i never flashed stock rom before, just a little confused.. thanks :))
 

Mawth

Senior Member
Dec 11, 2014
84
29
Correct. You will have a stock system, recovery, etc. Bootloader will still be UNLOCKED. If you plan to re-lock the bootloader, make sure the phone boots before doing so.
 

AlienTeck

Senior Member
Oct 31, 2016
248
104
Quote:
Originally Posted by Simoom Sadik
hi. currently i'm on a custom rom. i have unlocked bootloader & latest TWRP.
i wanted to flash stock rom by following this guide.
i've downloaded the last Oreo 8.1 bullhead-opm7.181205.001-factory-5f189d84.zip factory image released for Nexus 5x
uncompressed the whole zip file and got the following .img files

android-info.txt
boot.img
bootloader-bullhead-bhz32c.img
radio-bullhead-m8994f-2.6.42.5.03.img
recovery.img
system.img
vendor.img

there was no cache.img and userdata.img in the zip file.
since i'm on a custom rom, do i need to flash cache.img and userdata.img if i want to go full stock?

Is your system still working? After updating to the latest OS, the computer now do not recognize the phone and only shows up as unknown device and no ADB access at all.. And no way to go back either..

Since ADB access is more important than stock I would be happy with going back to OS7 as there is not much advancement with OS8..

---------- Post added at 07:10 PM ---------- Previous post was at 07:07 PM ----------

This seems like the best place to ask this (I couldn't find an official twrp thread..). I've searched many times and can't find an answer. Why are my twrp backups not able to boot on this phone? I've never had trouble on any other phone with this. On my 5X, I always get stuck on the google logo after restoring a backup, regardless of which partitions I restore. The first time, I thought it had to do with one of them being different going back to stock from Lineage, but even immediately restoring a stock backup after a clean flash does the same thing. I can get back into twrp, but never Android. The only way forward from that point is re-flashing. I had the latest twrp installed (it's been a couple months, so it's possible there's a new version.

You are using a version of TWRP which does not compress the data properly so save the data in uncompressed or get a fixed version where compression is fixed.. There was also a version where boot was saved as recovery.. And since both boot and recovery were the same data, flashing it back did not work..
 

fvisagie

Senior Member
Nov 14, 2014
117
39
Recommended TWRP version

You are using a version of TWRP which does not compress the data properly so save the data in uncompressed or get a fixed version where compression is fixed.. There was also a version where boot was saved as recovery.. And since both boot and recovery were the same data, flashing it back did not work..

What version TWRP do you recommend? I've been using the same 3.2.1-0 as @grabber5.0. Although more recent versions have been released, the Nexus 5x TWRP thread seems out of date and I'd appreciate your recommendation.

Specifically, the TWRP 3.2.3-0 changelog mentions
* Remove SuperSU from TWRP
Is SuperSU rooting no longer possible, or what else does that mean?

Thanks!
 
Last edited:

AlienTeck

Senior Member
Oct 31, 2016
248
104
What version TWRP do you recommend? I've been using the same 3.2.1-0 as @grabber5.0. Although more recent versions have been released, the Nexus 5x TWRP thread seems out of date and I'd appreciate your recommendation.

Specifically, the TWRP 3.2.3-0 changelog mentions

Is SuperSU rooting no longer possible, or what else does that mean?

Thanks!


I have been using magiksk for long time so no idea about superSU, also Ever since the OS update I have no access to ADB, but I think I have been using 3.2.3 and above TWRP versions.

I tried a much shorter USB cable I got with a powerbank and got ADB working so flashed TWRP. But it gets written over so I have to flash and then reboot into TWRP a few times for it to stick.. But at long last after over 6 months got ADB working again after installing android studio. This is like the USB cable I had originally, which worked to transfer data but after replacing he motherboard the cable did not work for data but still working for charging. Although I am not sure what the longer cables problem is as I was using it for over an year without problems. So now that google has stopped support I can at least flash some new roms and updates..
 
Last edited:

meyerweb

Senior Member
Jun 19, 2010
2,407
1,141
I'm sorry if this has been asked and answered. I've done several searches and, if the answer is here, I can't figure out what to search for.

Anyway, newb to the 5X. Just picked up a used one to use as a second device for a specific purpose, and am trying to root. I've successfully unlocked the phone and installed TRWP 3.2.3-0-bullhead. I reboot into TWRP to install SuperSU (SRS-SuperSU-v2.82-SR5-20171001224502.zip), but I can't find the file. In TWRP, the scdard folder shows empty. (If I boot normally, I can see the zip file in both the top level directory and in the download folder, but I don't even see the download folder, or any others, in TWRP.)

The Nexus is running Android 8.1.0.

What am I missing? Any and all suggestions welcome. Many thanks.
 

CLPose

Senior Member
Jan 7, 2015
726
380
Buenos Aires
I'm sorry if this has been asked and answered. I've done several searches and, if the answer is here, I can't figure out what to search for.

Anyway, newb to the 5X. Just picked up a used one to use as a second device for a specific purpose, and am trying to root. I've successfully unlocked the phone and installed TRWP 3.2.3-0-bullhead. I reboot into TWRP to install SuperSU (SRS-SuperSU-v2.82-SR5-20171001224502.zip), but I can't find the file. In TWRP, the scdard folder shows empty. (If I boot normally, I can see the zip file in both the top level directory and in the download folder, but I don't even see the download folder, or any others, in TWRP.)

The Nexus is running Android 8.1.0.

What am I missing? Any and all suggestions welcome. Many thanks.

Hi! I can only think that TWRP has no access to your data. Remember to allow TWRP to access your internal memory (a factory reset should prompt some warning about TWRP accessing your data). If you can't see your internal storage, try with some USB OTG. And finally, if I were you, I'd try with Magisk instead of SuperSU. Good luck!
 

meyerweb

Senior Member
Jun 19, 2010
2,407
1,141
Thanks. I'll check out Magisk, and try the reset. (It's been while since I've rooted a phone. ;) )
 

freddienuxx

Senior Member
Dec 11, 2012
1,685
339
Google Pixel 6 Pro
Hello guys big issue trying to root and every time I unlock the bootloader and flash TWRP or don't flash TWRP I reboot to system then back to bootloader it locks! Is there a fix for this? I mean every time reboot to bootloader it relocks after unlocking. Been dealing with this for 8hrs. Thx In Advance
 

droidpulkit

Member
May 29, 2013
22
0
Toronto
pulkitkumar.me
Hello guys big issue trying to root and every time I unlock the bootloader and flash TWRP or don't flash TWRP I reboot to system then back to bootloader it locks! Is there a fix for this? I mean every time reboot to bootloader it relocks after unlocking. Been dealing with this for 8hrs. Thx In Advance

Wait did the phone you have was locked by AT&T or some other carrier?
 

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  • 262
    [SIZE=+3]Heisenberg's How-To Guide For Beginners[/SIZE]
    [SIZE=+2]Nexus 5X[/SIZE]
    GLoF1eq.jpg

    [SIZE=+1]Intro[/SIZE]

    This thread will serve as a location for basic how-to guides for the Nexus 5X. I'm going to start off with a couple of the more obvious ones and go from there. If anyone has any suggestions for additions please feel free to let me know.

    If you're unsure about something please read the FAQ section in post #2 before creating a post to ask a question.

    [size=+1]Prerequisites[/size]:

    You'll need a working adb/fastboot environment on your PC to get through some of these guides. Below are two options for install.

    Please do not install adb/fastboot via any means other than the Android SDK, using other tools (like Minimal adb & fastboot) can lead to an outdated setup and various problems with flashing. You've been warned, other tools will not be supported in this thread.

    Option A
    Google hosts ADB/Fastboot (platform-tools) for Windows, OSX, and Linux. This is a minimal download, in contrast to Option 2. These links and file sizes may be updated periodically by Google. If using Windows, download the Google USB Driver and follow the driver install instructions. Once you have downloaded the platform-tools zip, extract the file then transfer the platform-tools folder to your desktop. The platform-tools folder contains adb, fastboot, and several other files. Note that clicking any link for platform-tools will immediately start a download.

    *Windows: platform-tools. Google USB Driver install.
    *OSX: platform-tools. For additional details on how to use OSX and adb/fastboot commands, see post #3.
    *Linux: platform-tools.

    See Option B below for old method to install adb/fastboot:

    Option B
    Go here to download the Android SDK, which will give you most updated version of adb and fastboot. Scroll to the bottom of the page and find Other Download Options>SDK Tools Only, and grab the right version for your OS. While it's downloading create a folder in C:\ called SDK (C:\SDK). Once you've downloaded the zip you can extract it into your C:\SDK folder. Navigate to C:\SDK\android-sdk-windows and open SDK Manager.exe. In SDK Manager you need to install the following packages:

    Tools> Android SDK Tools, Android SDK Platform-tools
    Extras> Android Support Repository, Google USB Driver

    Once you have installed those, inside C:\SDK you should see some new folders, one of them will be called platform-tools, within that folder you should see fastboot.exe and adb.exe. I'll refer to this as your fastboot folder/directory or working folder/directory during this guide.


    For Option A and B, make sure adb is correctly installed. Open a command prompt from within your fastboot folder (hold shift + right click, select open command prompt here) and issue this command:
    Code:
    adb version

    If it returns a version number for Android Debug Bridge then you're good to go.

    You can test adb by connecting your device to your PC while booted into Android (making sure that adb/usb debugging is enabled in Settings>Developer Options) with the screen unlocked and issuing this command:
    Code:
    adb devices
    It should return your device serial number, if so, adb is working.

    You can test fastboot by connecting your device to your PC while booted into the bootloader (power + volume down) and issuing this command:
    Code:
    fastboot devices
    It should return your device serial number, if so, fastboot is working.

    By attempting any of the processes listed this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches on fire, or turns into a hipster and claims to have been modified before it was cool.

    z7e6jQa.jpg

    [SIZE=+1]Quick Tips[/SIZE]

    How to boot into the bootloader:
    Power off your device. Once it's powered off hold power + volume down and the phone will boot into the bootloader. You can also use the following adb command:
    Code:
    adb reboot bootloader
    You can also use an app called Quick Boot to boot into the bootloader directly from Android (root required).

    How to boot into recovery:
    Boot into the bootloader (see above), use the volume keys to scroll through the options and use the power button to select the recovery mode option. You can also use the following adb command:
    Code:
    adb reboot recovery
    You can also use an app called Quick Boot to boot into the recovery directly from Android (root required).

    z7e6jQa.jpg

    [SIZE=+1]Index[/SIZE]

    1. How To Unlock Your Bootloader
    2. How To Install A Custom Recovery On Your Device
    3. How To Decrypt Your Data Partition
    4. How To Make A Nandroid Backup With TWRP Recovery
    5. How To Make An EFS Backup With TWRP Recovery
    6. How To Root
    7. How To Install A ROM with TWRP Recovery
    8. How To Install A Custom Kernel With TWRP Recovery
    9. How To Update To A New Build Of The Stock ROM
    10. How To Flash The Factory Images (Return To Stock)
    11. How To Flash The Factory Images (Return To Stock But Leaving Internal Storage Intact)
    FAQ can be found in post #2!

    z7e6jQa.jpg

    [SIZE=+1]1. How To Unlock Your Bootloader[/SIZE]

    • Go into Settings/About Phone, scroll down and click on ?build number? continuously until you see a toast notification telling you that you've enabled Developer Options. Go back to your Settings menu and enter Developer Options, scroll down and click on the ?Enable OEM Unlock? checkbox, also make sure you enable USB Debugging while you're in the Developer Options menu.
    • Power off your phone then boot into the bootloader (power + volume down).
    • Connect your phone to your PC via usb cable.
    • Open a command prompt from within your fastboot folder (navigate to where you have fastboot.exe located on your PC, shift + right click anywhere within that folder, select open command prompt here).
    • Check your fastboot connection by issuing this command:

      Code:
      fastboot devices

      It should return your device serial number, if not you need to make sure your drivers are installed correctly.​
    • Once you've confirmed your fastboot connection issue this command:

      Code:
      fastboot oem unlock
      This will erase all user data from the device!
    • You should now see a screen on your phone asking you to confirm this action, use the volume keys to scroll and the power key to confirm if you're sure you want to go ahead.
    • Allow the process to complete and then issue this command:

      Code:
      fastboot reboot
    • Allow everything to go ahead and once finished you can disconnect your usb cable.

    Important: do not relock your bootloader unless your phone is fully stock. You must flash the factory images first in order to remove root and custom recovery (if you have them), if this precaution isn't taken you may end up with a brick. Please see section 10 of this guide for full instructions on how to return to stock.

    z7e6jQa.jpg

    [SIZE=+1]2. How To Install A Custom Recovery On Your Device[/SIZE]

    Prerequisites: unlocked bootloader (section 1). Please read FAQ #7 if using TWRP 3.0.2-1 or 3.0.2-2.

    • Download TWRP Recovery onto your PC.
    • Make sure you check the md5 to verify its integrity (where possible).
    • Place the file in your fastboot folder (this is where fastboot.exe is located on your PC).
    • Power off your phone then boot into the bootloader (power + volume down).
    • Open a command prompt from within your fastboot folder (navigate to where you have fastboot.exe located on your PC, shift + right click anywhere within that folder, select open command prompt here), enter this command:

      Code:
      fastboot flash recovery filename.img

      (The recovery filename in the command will change depending on which recovery you're flashing)
    • Use the volume keys to scroll and power key to select the Reboot Bootloader option. Once the phone has booted back into the bootloader, use the volume keys to scroll and the power key to boot into your newly flashed recovery. It's now safe to disconnect your usb cable. If using Nougat 7.0 or newer, you must now boot directly into TWRP and flash SuperSU (or your preferred root alternative) so that TWRP will persist between reboots.
    When TWRP boots up you'll be asked whether you want to allow system modifications or to keep it read-only, choose to allow system modifications, there's no benefit to keeping it read-only.

    Do not flash the version of SuperSU that TWRP offers to flash for you in order to give you root, it is not compatible and will cause problems. When you attempt to reboot out of TWRP it will tell you that it's detecting that you don't have root and it will offer to root for you, skip past this.


    Some users need a custom recovery for a temporary period, so they live boot the recovery. In this scenario, the custom recovery replaces the stock recovery until a reboot is performed. Place the file in your fastboot folder then enter this command:

    Code:
    fastboot boot filename.img

    (The recovery filename in the command will change depending on which recovery you're flashing)

    z7e6jQa.jpg

    [SIZE=+1]3. How To Decrypt Your Data Partition[/SIZE]

    This is no longer necessary as long as you use TWRP 2.8.7.1 or newer

    Prerequisites: unlocked bootloader (section 1).

    TWRP recovery cannot decrypt your data partition at this stage. In order for TWRP to be able to read/write on your data partition (to root or create a nandroid backup) you will need to format it, a format will remove encryption.

    • Boot into the bootloader and connect your phone to your PC via usb cable.
    • Open a command prompt from within your fastboot folder (navigate to where you have fastboot.exe located on your PC, shift + right click anywhere within that folder, select open command prompt here), enter this command:
      Code:
      fastboot format userdata
      Please note: this will erase all user data from the device!
    • Once the process has completed you can either reboot normally:
      Code:
      fastboot reboot
      Or you can reboot back to the bootloader in order to undertake another task:
      Code:
      fastboot reboot-bootloader

    z7e6jQa.jpg

    [SIZE=+1]4. How To Make A Nandroid Backup With TWRP Recovery[/SIZE]

    Prerequisites: unlocked bootloader (section 1), TWRP recovery (section 2).

    A nandroid backup is a very important thing to have before installing any custom software on your device. It's basically a backup of your stock system that you can fall back on if anything goes wrong or if you just want your stock ROM back. You can also use the backup tool to create a backup of your favourite ROM set up exactly the way you like it. The backup you create can be easily restored using the restore tool in TWRP recovery.

    Boot TWRP recovery, select the backup option from the TWRP home screen, check the system/data/boot boxes, and swipe to backup. The process will take a few minutes.

    z7e6jQa.jpg

    [SIZE=+1]5. How To Make An EFS Backup With TWRP Recovery[/SIZE]

    An EFS backup is very important to have, if your EFS partition becomes corrupt you will have no IMEI, and therefore will not be able to use the phone as a phone. Making an EFS backup is insurance against this catastrophic event. Without a backup, restoring your EFS can be extremely difficult or impossible. The backup you create can be easily restored using the restore tool in TWRP recovery.

    Please read FAQ #7 if using TWRP 3.0.2-1 or 3.0.2-2. Boot into TWRP and select the backup option from the TWRP home screen, make sure only the EFS box is selected, and swipe to backup. The process will take a few seconds. Keep a copy of the backup on your phone and also keep another copy somewhere safe.

    z7e6jQa.jpg

    [SIZE=+1]6. How To Root[/SIZE]

    Prerequisites: unlocked bootloader (section 1), TWRP recovery (section 2).

    • Download the latest root method of your choosing to your phone:
      Magisk
      SuperSU Stable
      SuperSU Service Release (SuperSU beta channel)
      Or to root Android Nougat 7.0 visit this thread: Use SuperSU 2.78 or newer.
      [WIP] Android N Preview
    • Boot into TWRP recovery and enter the install menu.
    • Navigate to where you have SuperSU stored on your internal storage and select it.
    • Swipe to install.
    • Once you've installed SuperSU you'll have an option to wipe cache/dalvik and an option to reboot system. Wipe the cache/dalvik, hit the back button, and hit the reboot system button. That's it.
    Do not flash the version of SuperSU that TWRP offers to flash for you in order to give you root, it is not compatible and will cause problems. When you attempt to reboot out of TWRP it will tell you that it's detecting that you don't have root and it will offer to root for you, skip past this. You do have root, ignore this every time it comes up.

    z7e6jQa.jpg

    [SIZE=+1]7. How To Install A ROM with TWRP Recovery[/SIZE]

    Prerequisites: unlocked bootloader (section 1), TWRP recovery (section 2), vendor.img (section 9).

    Installing a ROM is a straight forward and easy process. Before you install anything you should make a nandroid backup (instructions above). Next, install the vendor.img that matches the Google security OTA that the ROM you want to install is based on. Find the vendor.img inside the factory images provided by Google then flash this file with fastboot (section 9).

    • Download a ROM and appropriate Gapps package and place on your device.
    • Boot into your custom recovery.
      • Select the wipe option from the TWRP home screen.
      • Perform a Factory Reset.
      • Select advanced wipe.
      • Check the system, data, cache, and dalvik cache options.
      • Swipe to wipe.
    • Install the ROM.
      • Select the install option from the TWRP home screen.
      • Navigate to where you have the ROM zip stored on your sd card and select it.
      • Swipe to install.
        Most ROMs will run an installer script at this point but some ROMs have what is called an Aroma Installer which allow you to choose some install options before the script runs.​
      • You will also need to install the appropriate gapps package directly after installing the ROM.
    • Once you've installed all necessary zips you'll have an option to wipe cache/dalvik and an option to reboot system. Wipe the cache/dalvik, hit the back button, and hit the reboot system button.

    z7e6jQa.jpg

    [SIZE=+1]8. How To Install A Custom Kernel With TWRP Recovery[/SIZE]

    Prerequisites: unlocked bootloader (section 1), TWRP recovery (section 2).

    A custom kernel can open up a new level of control over your device, such as overclocking/underclocking, undervolting, changing governors, changing I/O schedulers, adjusting colour calibrations, adjusting sound calibrations, and many other options.

    • Download a kernel that is compatible with your current ROM.
    • Check the md5 to verify its integrity.
    • Enter TWRP recovery.
    • Select the install option from the TWRP home screen.
    • Navigate to the kernel and select it.
    • Swipe to install.
    • You'll have an option to wipe cache/dalvik and an option to reboot system. Wipe the cache/dalvik, hit the back button, and hit the reboot system button.

    Once your phone has booted up you can use a kernel tuning app to change governors, I/O scheduler, clock speed, and other options. Some of the popular kernel apps are Kernel Auditor, EX Kernel Manager, Trickster Mod, No Frills, Kernel Tuner, and many more.

    z7e6jQa.jpg

    [SIZE=+1]9. How To Update To A New Build Of The Stock ROM[/SIZE]

    Prerequisites: unlocked bootloader (section 1).

    This method does not wipe your data, so you will keep your apps and settings. You should have no problems, however, if you experience problems you may need to perform a factory reset and flash again. Make a backup first and transfer it to your PC.

    • Download the latest build via the appropriate factory images for your model (Nexus 5X/Bullhead) here.

      Note: Android 7.1.2 and newer factory images do not contain cache.img. Do not wipe the cache.img for this process when using or moving to Android 7.1.2 or newer. If you have wiped cache.img, download the most recent Android 7.1.1 factory image and flash the cache.img from that zip archive.

    • Unzip the bullhead-xxxxxx-factory-xxxxxxxx (x's replace variables) into a directory on your PC (for this guide we'll use C:\bullhead\).
    • Once unzipped you should have a folder named bullhead-xxxxxx (x's replace variables). Open it and move the following files to a new directory named C:\bullhead\images\:
      • bootloader-bullhead-bullhead-xx.xx.img
      • radio-bullhead-bullhead-xx.xx.img
      (Please note that radio and bootloader naming changes from build to build so the filenames and below commands will change with them)
    • Within C:\bullhead\bullhead-xxxxxx\ you'll see another zip archive named image-bullhead-xxxxxx, unzip the contents of that zip into the C:\bullhead\images\ folder we created before. Now within C:\bullhead\images\ you should have the following files:
      • android-info.txt
      • boot.img
      • bootloader-bullhead-bullhead-xx.xx.img
      • cache.img
      • radio-bullhead-bullhead-xx.xx.img
      • recovery.img
      • system.img
      • userdata.img
      • vendor.img
    • Boot into the bootloader and connect your phone to your PC via usb cable.
    • Open a command prompt from within your fastboot folder (navigate to where you have fastboot.exe located on your PC, shift + right click anywhere within that folder, select open command prompt here), enter these commands to flash:
      Code:
      fastboot flash bootloader C:\bullhead\images\bootloader-bullhead-bullhead-xx.xx.img
      fastboot reboot-bootloader
      fastboot flash radio C:\bullhead\images\radio-bullhead-bullhead-xx.xx.img
      fastboot reboot-bootloader
      fastboot flash boot C:\bullhead\images\boot.img
      fastboot erase cache
      fastboot flash cache C:\bullhead\images\cache.img
      fastboot flash recovery C:\bullhead\images\recovery.img
      fastboot flash system C:\bullhead\images\system.img
      fastboot flash vendor C:\bullhead\images\vendor.img

      You can skip flashing the recovery if you wish, but even if you do the stock recovery may be patched on the first boot anyway. So you'll need to flash TWRP and SuperSU again if you need/want those, as well as any other system modifications you may have had.
    • You'll have to flash SuperSU again now, plus add any mods that you previously had.

    z7e6jQa.jpg

    [SIZE=+1]10. How To Flash The Factory Images (And Return To Stock)[/SIZE]

    Prerequisites: unlocked bootloader (section 1).

    This section will explain how to return the phone to be like it was when it came out of the box. This will wipe everything from the phone. If you wish to flash the factory images without wiping your personal data from the internal storage please move on to the next section.

    Note: Android 7.1.2 and newer factory images do not contain cache.img. Do not wipe the cache.img for this process when using or moving to Android 7.1.2 or newer. If you have wiped cache.img, download the most recent Android 7.1.1 factory image and flash the cache.img from that zip archive.


    • Go to Settings/Backup & Reset and perform a factory data reset. This will remove all of your user data from the device (apps, settings, photos, music, etc).
    • Download the appropriate factory images for your model here.
    • Unzip the bullhead-xxxxxx-factory-xxxxxxxx (x's replace variables) into a directory on your PC (for this guide we'll use C:\bullhead\).
    • Once unzipped you should have a folder named bullhead-xxxxxx (x's replace variables). Open it and move the following files to a new directory named C:\bullhead\images\:
      • bootloader-bullhead-bullhead-xx.xx.img
      • radio-bullhead-bullhead-xx.xx.img
      (Please note that radio and bootloader naming changes from build to build so the filenames and below commands will change with them)
    • Within C:\bullhead\bullhead-xxxxxx\ you'll see another zip archive named image-bullhead-xxxxxx, unzip the contents of that zip into the C:\bullhead\images\ folder we created before. Now within C:\bullhead\images\ you should have the following files:
      • android-info.txt
      • boot.img
      • bootloader-bullhead-bullhead-xx.xx.img
      • cache.img
      • radio-bullhead-bullhead-xx.xx.img
      • recovery.img
      • system.img
      • userdata.img
      • vendor.img
    • Boot into the bootloader and connect your phone to your PC via usb cable.
    • Open a command prompt from within your fastboot folder (navigate to where you have fastboot.exe located on your PC, shift + right click anywhere within that folder, select open command prompt here), enter these commands to flash:
      Code:
      fastboot flash bootloader C:\bullhead\images\bootloader-bullhead-bullhead-xx.xx.img
      fastboot reboot-bootloader
      fastboot flash radio C:\bullhead\images\radio-bullhead-bullhead-xx.xx.img
      fastboot reboot-bootloader
      fastboot flash boot C:\bullhead\images\boot.img
      fastboot erase cache
      fastboot flash cache C:\bullhead\images\cache.img
      fastboot flash recovery C:\bullhead\images\recovery.img
      fastboot flash system C:\bullhead\images\system.img
      fastboot flash vendor C:\bullhead\images\vendor.img

      If you wish to you can also relock the bootloader with this command:
      Code:
      fastboot oem lock
      (This command will wipe all user data from the device)

      Important: do not lock the bootloader unless you have first flashed the stock images. Locking the bootloader while you have a custom recovery installed can result in a brick. Please also note that the locking procedure will wipe all data on an encrypted device.

      Once all commands/flashes are complete you can reboot the device:
      Code:
      fastboot reboot

    z7e6jQa.jpg

    [SIZE=+1]11. How To Flash The Factory Images (Return To Stock But Leaving Internal Storage Intact)[/SIZE]

    Prerequisites: unlocked bootloader (section 1), TWRP recovery (section 2). Note: Android 7.1.2 and newer factory images do not contain cache.img. Do not wipe the cache.img for this process when using or moving to Android 7.1.2 or newer. If you have wiped cache.img, download the most recent Android 7.1.1 factory image and flash the cache.img from that zip archive.

    This section will explain how to return the phone to be like it was when it came out of the box, except it will not wipe any of your personal data (photos, music, etc) from the internal storage.


    • Download the appropriate factory images for your model here.
    • Unzip the bullhead-xxxxxx-factory-xxxxxxxx (x's replace variables) into a directory on your PC (for this guide we'll use C:\bullhead\).
    • Once unzipped you should have a folder named bullhead-xxxxxx (x's replace variables). Open it and move the following files to a new directory named C:\bullhead\images\:
      • bootloader-bullhead-bullhead-xx.xx.img
      • radio-bullhead-bullhead-xx.xx.img
      (Please note that radio and bootloader naming changes from build to build so the filenames and below commands will change with them)
    • Within C:\bullhead\bullhead-xxxxxx\ you'll see another zip archive named image-bullhead-xxxxxx, unzip the contents of that zip into the C:\bullhead\images\ folder we created before. Now within C:\bullhead\images\ you should have the following files:
      • android-info.txt
      • boot.img
      • bootloader-bullhead-bullhead-xx.xx.img
      • cache.img
      • radio-bullhead-bullhead-xx.xx.img
      • recovery.img
      • system.img
      • userdata.img
      • vendor.img
    • Boot into TWRP recovery and enter the wipe menu, select advanced wipe, check only the data box and swipe to wipe.
    • Go to the TWRP main menu and enter the reboot menu, select bootloader. The phone will now boot into the bootloader, once it has you can connect your phone to your PC via usb cable.
    • Open a command prompt from within your fastboot folder (navigate to where you have fastboot.exe located on your PC, shift + right click anywhere within that folder, select open command prompt here), enter these commands to flash:
      Code:
      fastboot flash bootloader C:\bullhead\images\bootloader-bullhead-bullhead-xx.xx.img
      fastboot reboot-bootloader
      fastboot flash radio C:\bullhead\images\radio-bullhead-bullhead-xx.xx.img
      fastboot reboot-bootloader
      fastboot flash boot C:\bullhead\images\boot.img
      fastboot erase cache
      fastboot flash cache C:\bullhead\images\cache.img
      fastboot flash recovery C:\bullhead\images\recovery.img
      fastboot flash system C:\bullhead\images\system.img
      fastboot flash vendor C:\bullhead\images\vendor.img
      Once all commands/flashes are complete you can reboot the device:
      Code:
      fastboot reboot

    z7e6jQa.jpg
    FAQ can be found in post #2!

    aDlDoZJ.jpg

    Donate To Me
    45
    [size=+1]Frequently Asked Questions[/size]

    1. How do I boot into the bootloader?

    Power off your device. Once it's powered off hold power + volume down and the phone will boot into the bootloader. You can also use the following adb command:
    Code:
    adb reboot bootloader
    You can also use an app called Quick Boot to boot into the bootloader directly from Android (root required).

    2. How do I boot into recovery?

    Boot into the bootloader (see above), use the volume keys to scroll through the options and use the power button to select the recovery mode option. You can also use the following adb command:
    Code:
    adb reboot recovery
    You can also use an app called Quick Boot to boot into the recovery directly from Android (root required).

    3. When issuing the fastboot flashing unlock command it doesn't work, I only get a list of possible commands. What's going on?

    This is usually due to having an outdated adb/fastboot setup. If you installed adb/fastboot by any means other than via the Android SDK this is probably the cause. Visit the prerequisites section in the beginning of this guide to properly install adb/fastboot and ensure that it's up to date.

    4. How do I take an OTA or update if I have root or other system modifications on the stock ROM?

    You can't take an OTA update while you have root or any system modifications. You'd need to use fastboot to flash the system, boot, and recovery images. It's much easier to just flash the newer build with fastboot, see section 9 of this guide for full instructions.

    5. Does taking an OTA update wipe my user data?

    No, it doesn't.

    6. Do I need to make an EFS backup?

    Absolutely yes. An EFS backup is extremely important. If your EFS partition becomes corrupt, your IMEI will disappear and you will not be able to use the phone as a phone. Without a backup it can be extremely difficult (or impossible) to restore your EFS. See the next question for an EFS backup related issue and solution.

    7. I have a bootloop after restoring my EFS backup in TWRP 3.0.2-1. What can I do?

    TWRP 3.0.2-1 and 3.0.2-2 are the first official TWRP releases with Nougat 7.0 or newer compatibility. Unfortunately, there are separate bugs affecting TWRP 3.0.2-1 and 3.0.2-2. A member of the TWRP development team details these issues right here. This link redirects to a thread in the Nexus 6P forums but also applies to the Nexus 5X. Read the original post of that same thread to learn how to resolve this EFS restore bootloop. You must use ADB and the phone must be booted in TWRP to resolve this issue. These ADB commands work on the Nexus 5X and 6P.

    8. Can I flash just the xxxxxx.img from the factory image without losing my data?

    Flashing userdata.img will format your entire phone (personal data including SMS/MMS, pictures, downloaded files, etc). You can flash any combination of these partitions (boot, system, vendor, radio, or bootloader) and this will leave your personal data intact. However, any mods that you have installed into system, vendor, or boot will be overwritten and returned to the default factory image setup when you flash these partitions. Flashing recovery.img or a newer version of your custom recovery will replace your existing recovery.

    9. After updating my ROM, I get this message on every boot: "There's an internal problem with your device. Contact your manufacturer."

    This warning indicates a mismatched vendor and system partition. The vendor partition was formerly integrated in the system partition for previous Nexus devices but is now a separate partition that must be flashed for each Google security update. Download a factory image and update your vendor partition using fastboot so that it matches your rom's OS build and monthly security update. If you have a file explorer installed on your phone, you can determine which vendor.img is installed by navigating to /vendor/build.prop and clicking on the build.prop. The specific vendor installed will be a combination of six numbers and letters listed in all capitals (example: NMF26F) in the ro.vendor.build.fingerprint line. These will always match up with the factory image of the same Android build (six digit alphanumeric name) for this device.

    Vendor.img is specific to each OTA and contains proprietary binaries for the phone that regularly receive updates to resolve security risks. If you are a custom rom user, make sure that you flash the vendor.img for the Google monthly security update that you are moving to. Be aware that sometimes AOSP roms utilize the AOSP master branch which has a newer Android build than the monthly security update for this device. You will still need to install that month's vendor.img.

    The phone will fail to boot if you mismatch the vendor.img with a different Android version. For instance, a 6.0 Marshmallow vendor.img will not allow your phone to boot on 7.0 Nougat. The vendor.img is typically not included in the custom rom zip but is often available as a separate download in the custom rom thread's first post.
    20
    Here is the modified boot image for MMB29K
    bullhead-mmb29k-mboot.zip (tested working)

    The boot image has the following modifications per Chainfires instructions, just like the modified mdb08i boot image:
    - patched sepolicy
    - disabled dmverity
    - disabled forceencrypt

    This is for system root.
    10
    Here are modified boot images for MDB08L & MDB08M & MMB29K
    bullhead-mdb08l-mboot.zip (tested working)
    bullhead-mdb08m-mboot.zip (tested working)
    bullhead-mmb29k-mboot.zip (tested working)

    These boot images have the following modifications per Chainfires instructions, just like the modified mdb08i boot image:
    - patched sepolicy
    - disabled dmverity
    - disabled forceencrypt
    7
    Updated 2015/12/23!

    Updated:


    I've edited the guide to include separate sections for systemless root and traditional root. I'll also be adding some extra information for updating and flashing the factory images soon. If I've missed any of the posts by @reddv1 that contain modified boot.img's please let me know and I'll add them to the traditional root section.

    EDIT: Extra sections for updating and flashing factory images have been added, plus a section on creating an EFS backup. I've also added an FAQ in the second post.