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[ROOT] HOWTO: AT&T H910 up to v20g (FULLY TESTED)

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fire_qc

Senior Member
Mar 2, 2019
74
7
huh what warning are you seeing? did you format your phone and do a wipe? It should be the sigh in screen.
Yes I format, and after I flash .zip.. It's a big warning that tells the boot will not go trought but it goes. If I wanna get rid of this warning, any idea??? And right now, still waiting the first boot after H910 stock
 
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Darnrain1

Senior Member
Jan 2, 2018
54
14
huh what warning are you seeing? did you format your phone and do a wipe? It should be the sigh in screen.
We want to ma
Yes I format, and after I flash .zip.. It's a big warning that tells the boot will not go trought but it goes. If I wanna get rid of this warning, any idea???
Yeah no there is ways to change the picture but the delay will always be there. I would say not to worry about it. It's because we rooted the phone. Anyway you should see the sign in screen. If so that means everything is working like it should.

Then install the updated twrp do a wipe install lineageos.
 

fire_qc

Senior Member
Mar 2, 2019
74
7
It takes a little while for the first boot -- be patient. It should NOT take longer than 10 minutes. If it does, something went wrong. Boot back to TWRP and try flashing the 10r zip again.

25 minutes later... Still AT&T logo... I have to reboot (remove and replace the battery) and now Android start...
 

Darnrain1

Senior Member
Jan 2, 2018
54
14
It takes a little while for the first boot -- be patient. It should NOT take longer than 10 minutes. If it does, something went wrong. Boot back to TWRP and try flashing the 10r zip again.

25 minutes later... Still AT&T logo... I have to reboot (remove and replace the battery) and now Android start...
I am thinking that there is still data on the data partition. Try and boot into twrp do a wipe restart system.
 

fire_qc

Senior Member
Mar 2, 2019
74
7
After 26 minutes waiting for the first boot, stil at AT&T logo (blue ball with stripes). So I remove and replace the battery, and now Android is started. Now I will activated dev mode, reboot in flashboot, flash new twrp in recovery and flash LineAgeOS... Sounds like a good plan??
 

Darnrain1

Senior Member
Jan 2, 2018
54
14
It takes a little while for the first boot -- be patient. It should NOT take longer than 10 minutes. If it does, something went wrong. Boot back to TWRP and try flashing the 10r zip again.

25 minutes later... Still AT&T logo... I have to reboot (remove and replace the battery) and now Android start...

For lineageos you need the new version of magisk

Magisk-v21.4.zip
 
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Darnrain1

Senior Member
Jan 2, 2018
54
14
After 26 minutes waiting for the first boot, stil at AT&T logo (blue ball with stripes). So I remove and replace the battery, and now Android is started. Now I will activated dev mode, reboot in flashboot, flash new twrp in recovery and flash LineAgeOS... Sounds like a good plan??
yeah install the OS first then magisk so you can have root.
Oh, do I have to install Magisk-v21.4.zip before LineAgeOS ???
update twrp do a wipe install Lineageos then magisk reboot and then you should not have any more problems famous last words. :)
 

Darnrain1

Senior Member
Jan 2, 2018
54
14
yeah install the OS first then magisk so you can have root.

update twrp do a wipe install Lineageos then magisk reboot and then you should not have any more problems famous last words. :)
It's tricky getting this installed on the lgv20

The updated twrp does not format correct that's why we have to use the old version. Because we started the os with out magisk installed the data partition may be encrypted again.
 
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Darnrain1

Senior Member
Jan 2, 2018
54
14
And you're damn right!!! LineAgeOS starting now!!! Yahoo! You're awesome!

Small thing is : Your device have failed a safety routine check..... blablabl...

But for the rest, you're a killa! Come over here someday, I wanna share beer with you guys! 🍻🍺🍺
You have to enable magisk hide in magisk under settings I think that should fix it. yay I am glad you got it going. :)
 

DarthTerios

New member
Aug 13, 2021
1
3
Thanks so much for these instructions. I am now enjoying Lineage on my V20.
I had problems and was worried I'd killed my phone - I could only get it into fastboot or the screen with static. Was wondering if it was because it was a V20h, when the instructions only mentioned up to V20g. I thought adb was working because 'adb devices' had found my phone... at some stage of my fiddling at least... but still I wondered if there was something not quite right about my adb setup (on Win10) and sure enough Device Manager - other - android had an exclamation mark. I pointed it at the correct LG driver and suddenly the Command Prompt I'd left open with step3.bat ... which had been 'waiting for device' ... started doing things. Thank you.
 

MaverickNextDoor

Senior Member
Oct 28, 2016
216
72
Warri
Verizon LG G3
LG V20
Hello all.

I followed the Dirty Santa instructions "successfully" but with the following hiccups:

  1. The unlock OEM option in developer options refused to stay on while on stock (I select it but it immediately slides back to off).
  2. The 10r zip flashes successfully but on trying to boot into system, TWRP tells me there's no OS installed.
  3. On flashing LOS 18.1, it tells me the "device has failed a routine safety check and will not boot", then proceeds to show the LOS boot animation for a while then goes back to the failed verification screen and then automatically reboots back to TWRP.
Any ideas will be appreciated.

Thanks in advance.
 
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parag0n1986

Senior Member
May 3, 2015
174
36
35
LG V20
OnePlus 7 Pro
Hello all.

I followed the Dirty Santa instructions "successfully" but with the following hiccups:

  1. The unlock OEM option in developer options refused to stay on while on stock (I select it but it immediately slides back to off).
  2. The 10r zip flashes successfully but on trying to boot into system, TWRP tells me there's no OS installed.
  3. On flashing LOS 18.1, it tells me the device has failed a verification and will not boot, then proceeds to show the LOS boot animation for a while then goes back to the failed verification screen and then automatically reboots back to TWRP.
Any ideas will be appreciated.

Thanks in advance
So sounds like your bootloader is unlocked if you have TWRP right? Not sure if this applies to this phone, but usually when I have a boot issue after a ROM flash, I format data and that usually fixes the issue. Not sure if it will help or not. Maybe try to flash Magisk first. Sometimes that works for me too. If you don't get it figured out, and nobody helps you. Feel free to PM me and I'll see what I can do
: )
 
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MaverickNextDoor

Senior Member
Oct 28, 2016
216
72
Warri
Verizon LG G3
LG V20
@parag0n1986

Thanks for responding.

Yes, I suppose my bootloader is unlocked since the usual "corrupt device" warning appeared when booting the h915 kdz (as part of the DirtySanta process). I can access fastboot mode by holding down vol up and power buttons. I did try formatting data partition after flashing the final h910r zip to no avail. I'll try flashing Magisk first and another clean install of the h910r zip.

I'll keep you posted.

Thanks again.
 

parag0n1986

Senior Member
May 3, 2015
174
36
35
LG V20
OnePlus 7 Pro
@parag0n1986

Thanks for responding.

Yes, I suppose my bootloader is unlocked since the usual "corrupt device" warning appeared when booting the h915 kdz (as part of the DirtySanta process). I can access fastboot mode by holding down vol up and power buttons. I did try formatting data partition after flashing the final h910r zip to no avail. I'll try flashing Magisk first and another clean install of the h910r zip.

I'll keep you posted.

Thanks again.
No problem. If you can get to fastboot, if I remember correctly you start the step3 bat. Of thats right, maybe try doing that again. I had to start all the way over 2 times when I did this phone lol! Hi just make sure you are using the correct TWRP version as well
 
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Darnrain1

Senior Member
Jan 2, 2018
54
14
Hello all.

I followed the Dirty Santa instructions "successfully" but with the following hiccups:

  1. The unlock OEM option in developer options refused to stay on while on stock (I select it but it immediately slides back to off).
  2. The 10r zip flashes successfully but on trying to boot into system, TWRP tells me there's no OS installed.
  3. On flashing LOS 18.1, it tells me the device has failed a verification and will not boot, then proceeds to show the LOS boot animation for a while then goes back to the failed verification screen and then automatically reboots back to TWRP.
Any ideas will be appreciated.

Thanks in advance.


You have to use an older version of twrp then do a format and wipe and install LOS and latest magisk that should work.

bty the failed a verification and will not boot screen is normal it every H910 lgv20 phone has that screen.

recovery-twrp-h910-2018-10-18.img

Magisk-v21.4.zip
 
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  • 2
    Hello anyone here?
    Please I need the working link for h910-10r.zip

    Its saying its in owner's trash

    View attachment 5404179


    I found it on android file host

    h910-10r.zip

    your also going to need this

    h910_root_pkg.zip
    1
    I found it on android file host

    h910-10r.zip

    your also going to need this

    h910_root_pkg.zip

    Awesome much appreciated.

    I used the OREO approach from this post:

  • 83
    ***WARNING***
    This is ONLY for the H910. If you flash H915 firmware on an H918 -- you WILL brick it.​

    If you are currently on Oreo, you can root your phone, but you CAN NOT keep Oreo - for now. This will downgrade you back to Nougat, which is rootable.

    I know this is a long post, but this is also a complicated root procedure. Please read the ENTIRE post before starting.
    Also, if you run into a problem, please use the search thread box to see if your problem has already been addressed. It will save having to ask the same questions over and over.

    If you want to restore to stock v10q after rooting, you can use this: link.

    Standard disclaimer: There are no guarantees in life. No part of this should brick your phone, but if it does somehow, that is on you.

    This should work on any H910 version, up to v20g, that is no longer rootable by DirtySanta (IE: dirtycow has been patched). It has been tested on 10m to 20g

    • Make sure that you have an SD card that has at least 8 gigs of free space. It CAN NOT be formatted FAT, or FAT32. It needs to be exFat or ext4, otherwise the zip won't fit (2 gig file limit on FAT and FAT32).
    • Make sure you have a working adb environment. I use Linux so hopefully this is a good resource. If not, you will have to Google this yourself: link.
    • Make sure that you have a working WiFi connection. Part of this process involves installing a terminal emulator. Since the phone will have no signal at that time, you use WiFi, or you can side load.
    • Download the H915 v10e KDZ: H91510e_00_VTR_CA_OP_1205.kdz.
      - WARNING: Do not use any newer H915 firmware, as they all have dirtycow patched (v10p, v10q), and I do not know if they increment ARB.
      - If they do increment ARB, then you will be stuck with a phone that can't be rooted, and you can't fix the modem! You have been warned.
    • Download the patched LG UP from this thread: link.
    • Make sure you install it in C:\Program Files (x86)\LG Electronics\LGUP or it will either read the wrong model file (if you had a previous installation of LG UP), or it will not be able to find the model file at all.
    • Put your phone into download mode (power off / hold vol. up / plug in USB cable)
    • Use LG UP to dump your phone. When you run it, there will be additional radio buttons.
      - Pick the one that says DUMP and click Start. You will be asked what partitions to dump, click the "select all" checkbox, and then you can uncheck userdata.
      - This is an OPTIONAL but HIGHLY recommended step. It is a good idea to have a full backup of your phone, but with this new procedure, this is no longer needed.
    • When it is finished, click the PARTITION DL radio button, pick the H915 v10e KDZ that you downloaded above, and click start. Make sure all partitions are checked.
    • Once it is complete, your phone should reboot into a nice new (old) Freedom Mobile ROM (complete the setup), and you may not have signal.
      - If you are on AT&T I understand that you will, but T-Mobile does not. Either way, this is normal.
    • Before continuing, make sure that you enable developer mode, and enable USB debugging. Also, make sure that your PC is authorized (plug the phone in and touch always allow, and then OK).
    • Also go ahead and download a terminal emulator -- NOT Termux. I recommend good old "Terminal Emulator for Andorid" -- the first thing that pops up if you search for "terminal"
    • Download this modified (by modified, I mean it contains all the extras needed to make this work) DirtySanta root package: link.
      - Extract this somewhere that you can run adb and fastboot from.
      - Check the SHA hash: 88a3a0f90c66a486807da3e69e9fb0a08c779efe
    • Download the v10r firmware + boot + system here: link (sorry - no time to dump and package 10v)
      - Check the SHA hash: 5451146030393e490dcfba3558b620badefe75cd
      - This includes v1.0 of the mk2000 kernel
    • Copy the zip, to your SD card, and insert it in the phone.
      - Alternatively, you can use adb to push the zip to your phone while in TWRP. This is NOT supported.
      - I switched to having people flash from SD card because too many people were having problems with adb.
      - If you want, try it, if it doesn't work, don't ask for help -- use the SD card method!
    Open two command windows. In each one change to the directory that you extracted the root package.

    In the first one execute:
    Code:
    adb logcat -s dirtysanta

    Then in the second one execute:
    Code:
    STEP1.BAT

    Wait till you get a prompt back then type (or copy / paste):
    Code:
    run-as con
    chmod 0777 /storage/emulated/0/*

    Now open up your terminal emulator on your phone and type:
    Code:
    applypatch /system/bin/atd /storage/emulated/0/dirtysanta

    Watch the window that has logcat running. When it says to run step 2, execute:
    Code:
    STEP2.BAT

    Once fastboot comes up -- it will be a really small red font that says, FASTBOOT MODE. Once that is up, execute:
    Code:
    STEP3.BAT
    This is flashing TWRP and the WW 2.0 kernel onto your phone. The phone will reboot once they are flashed.
    When it reboots, you will get a very nasty looking warning about the fact that your phone has been compromised and will not boot.
    This is due to running the engineering aboot and is normal -- don't panic your phone will boot. You will see this every time the phone reboots.

    At this point, you have H915v10e and TWRP. You can now boot into TWRP so that we can flash the H910 firmware back onto the phone:
    If you have re-enabled developer mode, and enabled USB debugging, and have your phone connected, you can execute the following in a command window:
    Code:
    adb reboot recovery

    Otherwise just pull the battery, put the battery back in, hold vol down + power till the LG logo appears. Release power, and then immediately press and hold it again until you get to a screen that asks if you want to factory reset your phone. Say yes twice and it will take you into TWRP. If the phone had the stock recovery, it would do a factory reset -- however, since you now have TWRP, that is what you are taken to instead. This is a key combination that is embedded into the bootloader that tells it to execute recovery - in this case TWRP. Hope that clears up some confusion as to why you get a screen asking you to factory reset your phone...

    Now that you are in TWRP you need to do a couple of things:

    • Format data. Wipe -> Format data. It will ask you to type "yes". If you don't do this, you will be prompted to enter a passcode, and will have 30 tries. If that happens, just boot back to TWRP and do this step again.
    • Wipe cache / dalvik cache
    • Flash the zip. Choose "Install" and browse to your SD card, and select the h910-10r.zip file. When complete hit the home button.
    • Now, format data again for good measure....

    Once the second format completes you can reboot your phone, and it will be just like you got it fresh off the factory floor, except it will have TWRP.
    No part of the H915 firmware is left on the phone. The only things that are not 100% stock v10r firmware are ABOOT (it is the US996 engineering aboot that is unlocked. It also gives the nasty warning on boot), BOOT (it is the 10q kernel with a few patches added by @askermk2000 - KCAL, Adreno idler, etc), and of course RECOVERY (TWRP).

    It takes a little while for the first boot -- be patient. It should NOT take longer than 10 minutes. If it does, something went wrong. Boot back to TWRP and try flashing the 10r zip again.

    Now that you have a phone with TWRP, feel free to download whatever root method you would like (SuperSU or Magisk).



    Old, unsupported ROMs will NOT work with the 10p, 10q or 10r firmware.
    If you want to run NATF or WETA (or any old, unsupported ROM that you find floating around these forums) you will need to flash the older 10m firmware: here.
    SHA: 1007dedb6e935b0bea1e25f28e39ccb8e69f9694
    This is JUST the firmware! It has no kernel, or system. You MUST flash a 10m or earlier ROM or your phone will not boot. If you forget, you can always boot back to TWRP and try again.
    The newer kernel should work, but I have not tested it with the older firmware. If it doesn't grab the WW2.0 kernel, it works fine with 10m.


    For the latest kernel, please visit @askermk2000's thread: here

    Do NOT flash firmware for the H918 -- it will brick your phone. Firmware for the other models won't work, but they won't brick your phone.

    Feel free to ask away if any of this doesn't make sense. I really hope that isn't the case now :)

    Most of all -- have fun. That is what this is supposed to be about!


    Again, If you want to restore to stock v10q, you can use this: link.

    Serious credits go out to:
    @me2151 for DirtySanta. Please visit his original thread and hit the thanks button.
    @smitel for Reversing LG UP and figuring out how unlock lab mode. No partition dl, no root on the new firmware. Again, hit the thanks button.
    @Prowler_gr for patching LG UP for the V20 not to mention finding that thread. I never go into the G5 forums, so I would have never seen it. AGAIN -- hit that thanks button.
    @USA-RedDragon for his Werewolf kernel. I know I sure like not having static on boot. Most people get the ability to hit thanks 6 or 7 times a day -- be sure to use up one more.
    @askermk2000 For the new 10q kernel. Dude doesn't even have a V20 and jumped in to help out.

    Seriously, these guys are the real devs, and the ones that have left the V20 scene are missed...

    -- Brian
    8
    FAQ:

    Q1: If I revert to stock will AT&T know that I rooted my phone?
    A1: Nope. Unlike Samsung phones (at least older ones, I don't know about current ones), there is no KNOX style indicator that shows how many times a phone has been flashed.

    Q2: Do we have to flash ALL of the H915 firmware, that seems like a waste?
    A2: You would be correct -- it is a waste, but I am going to need more time to test and make sure that only the XBL and ABOOT need to be flashed AND that doesn't break trusted boot. As I have stated, the H910 and H915 have the same PBL. I ran my phone with the H915 XBL, with the rest of the firmware being H910 and I don't have a brick -- but I did it manually and not though LG UP. When I feel like wiping my phone again, I will test this.

    Q3: Can any other variants be rooted with this method?
    A3: Maybe. I was able to get the patched LG UP to recognize a KDZ that I modified, and it let me flash. My next step is to completely roll my own KDZ. If that works, then ANY LG phone will be rootable simply by flashing a KDZ.
    A3: YES! It turns out that the LS997 is able to use the VS995 KDZ. I have written up a post on the procedure.

    Q4: If that works, and you can roll your own KDZ, can you get around ARB?
    A4: I believe so. Now that we have the ability to take a dump of an unmodified / stock / out of the box phone, we could dump the XBL (this is what updates ARB), and package that up with an older ABOOT. I am mainly talking about H918s here, since all other V20s work with the engineering ABOOT. But it will also apply if AT&T ever increments ARB on the H910.
    Nope, there is no getting around ARB. Once a particular ARB version is blown into your QFPROM, you *MUST* use a boot stack that has that ARB version, and that is basically the entire firmware except for boot, recovery, laf and system.

    Q5: Will the AM&FM Radio still work
    A5: Yes.

    Q6: Why are my boot times longer after rooting?
    A6: In order to unlock the bootloader, an engineering aboot had to be used, and a lot of additional data is generated on boot.

    Q7: Can I return my phone to stock?
    A7: This was addressed in the post above, but I will address it again. Yes. For the link, see the post above.
    5
    @runningnak3d could you update the link from DirtySanta root package?

    all the root files for this thread are in my AFH (in my signature) the root package is here >> https://androidfilehost.com/?fid=1322778262903990218
    4
    Jerry SQ to the rescure, follow these steps to fix signal and data (h910 only):
    1 Dowload US99610f.kdz and F800K10e.kdz firmware, LGUP with patch in the first post
    2 KDZ F800K10e.kdz, partition dl, tick select all, wait for it to boot into rom, install TWRP with dirtysanta steps, boot into TWRP, then select reboot, select bootloader (or using adb, your choice, but the bootloader need to be unlocked)
    3 type these codes in booloader
    fastboot erase modemst1
    fastboot erase modemst2
    4 wait till it done, don't rebooted the phone yet, instead, pull the batterry out, get back to TWRP by hardware button
    5 format your rom, reboot back to TWRP, wipe Cache, System, internall storage, then poweroff the phone
    6 get in dowload mode, KDZ US996 firmware, partition dl, tick select all, boot into rom, if it stuck somewhere, factory reset might do the trick
    7 when it boot up, it will get bootloop after you get in the setup screen (i don't know it'll happen to you, but for me it'll bootloop)
    8 pull battery out, get in dowload mode, KDZ F800K firmware, partition dl, TICK MANUALLY EVERY THING EXEPT BOOT, MODEM, ABOOT, ABOOTBAK
    9 when it done, you will have signal, data mobile again, if you like, you can use F800K firmware or you can follow dirtysanta steps and install any rom you like
    4
    Kernel with some features

    Ok :)

    This one is a bit more experimental. I've looked at some patches from Werewolf and D.O.T.S Kernel, and picked a few compatible ones that looked rather straight forward without risk of complications.

    So we have:
    KCAL - the one that started it all.
    Adreno Idler - Battery savings.
    Disable software CRC checking of SD Card - More performance.
    Remove temperature polling - Battery savings.
    Reduce DSI status check - Battery savings.
    Fixed USB erratic behavior with some chargers.
    Static Screen fixed.
    RCTD removed.

    ^^Let's hope it works :) Would welcome feedback.
    If it works nicely I'll make one for H918 as well.

    --removed-- Look here!