[Guide] Fix for Nexus 6P Bootloop of death | 8/22 - Android O Working

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StormCell

Senior Member
Jun 14, 2010
414
28
Bear Creek
For the longest time I had a permanent bootloop. Nothing worked. Then I tried the steps in #2674. My phone booted. The like a dumbass I tried to root. Phone is stuck on Google screen. Booted into Recovery again and wiped everything again. Tried installing PixelExperience. Phone wouldn't boot. Back into TWRP and wiped everything. When I tried to reboot TRWP says there is no OS. Redid BLOD install. Didn't work. Still no OS. Tried flashing boot image. Command Flash-all bat failed. I'm stuck.
 

Lughnasadh

Senior Member
Mar 23, 2015
3,900
4,166
Google Nexus 5
Huawei Nexus 6P
For the longest time I had a permanent bootloop. Nothing worked. Then I tried the steps in #2674. My phone booted. The like a dumbass I tried to root. Phone is stuck on Google screen. Booted into Recovery again and wiped everything again. Tried installing PixelExperience. Phone wouldn't boot. Back into TWRP and wiped everything. When I tried to reboot TRWP says there is no OS. Redid BLOD install. Didn't work. Still no OS. Tried flashing boot image. Command Flash-all bat failed. I'm stuck.

You didn't mention if you flashed the workaround zip after flashing Magisk and before booting when you first rooted.

Are you saying you tried to fastboot flash the last factory image and it didn't work?
 

StormCell

Senior Member
Jun 14, 2010
414
28
Bear Creek
I've never flashed Magisk. I tried rooting simply by flashing SuperSU. Guess I effed up.
Yes, I tried fastboot flashing the factory image and it failed as the command 'Flash-all.bat' failed.
 

Lughnasadh

Senior Member
Mar 23, 2015
3,900
4,166
Google Nexus 5
Huawei Nexus 6P
I've never flashed Magisk. I tried rooting simply by flashing SuperSU. Guess I effed up.
Yes, I tried fastboot flashing the factory image and it failed as the command 'Flash-all.bat' failed.
Flashing SuperSu instead of Magisk may have been your problem. That's been dead for years. All I can say is make sure your platform tools are up to date (latest is r30.0.2 I believe) and try flashing the factory image again.
 

etherbod

New member
Aug 1, 2020
1
0
thanks for the explanation dude, but the problem seems to be unresolved.
what to do when the phone is in a boot Loop and when you cannot access OEM and debugging settings.
do you have a solution for that ?
 

yurais

Senior Member
Feb 10, 2008
340
16
thanks for the explanation dude, but the problem seems to be unresolved.
what to do when the phone is in a boot Loop and when you cannot access OEM and debugging settings.
do you have a solution for that ?
Power it on
And while it is bootlooping , heat the back cover, very close to the camera, with a hair dryer...
Fear not, just heat hot enough and system will load... When it does, you know what to do... Run to the oem option .


Enviado desde mi SM-G975U1 mediante Tapatalk
 

GogoAkira

Member
Mar 15, 2017
16
0
Hey man the petition is almost at 4000, I never knew it existed till now so I just signed it, but the petition doesn't ask anything. From this post I understand what you want, but reading the petition many times I only see text such as "there is a solution, locked bootloaders could still run software from Google" so you never asked for them to release a modified img you just explained some things, this already might be a lost battle idk how many people still use this phone, I do :)
 

badabing2003

Recognized Contributor
Sep 17, 2012
1,003
920
Hi Everyone
My wife's Nexus 6p went to bootloop this week
The phone is unlocked, but I'm not able to write anything to the boot partition (even stock boot.img), Other partitions don't show issues.

Code:
C:\angler-opm7.181205.001>fastboot flash boot boot.img
fastboot: error: Couldn't parse partition size '0x'.

Code:
C:\angler-opm7.181205.001>fastboot flash boot_a boot.img
fastboot: error: Couldn't parse partition size '0x'.

However erase boot partition response find (not sure if that is meaningful)
Code:
C:\angler-opm7.181205.001>fastboot erase boot
Erasing 'boot'                                     OKAY [  0.024s]
Finished. Total time: 0.056s

Any ideas? any way to reformat the boot partition?
Thanks
 

badabing2003

Recognized Contributor
Sep 17, 2012
1,003
920
And flashing recovery fails with Permission denied.

Code:
C:\angler-opm7.181205.001>fastboot flash recover twrp3_1_1_4Cores.img
Sending 'recover' (16948 KB)                       OKAY [  0.496s]
Writing 'recover'                                  FAILED (remote: 'Permission denied!')
fastboot: error: Command failed

As you can see, some partition flashing works just fine
Code:
fastboot flash bootloader bootloader-angler-angler-03.84.img
Sending 'bootloader' (3554 KB)                     OKAY [  0.125s]
Writing 'bootloader'                               OKAY [  0.247s]
Finished. Total time: 0.432s

C:\angler-opm7.181205.001>fastboot reboot-bootloader
Rebooting into bootloader                          OKAY [  0.007s]
Finished. Total time: 0.011s

C:\angler-opm7.181205.001>fastboot flash radio radio-angler-angler-03.88.img
Sending 'radio' (48728 KB)                         OKAY [  1.309s]
Writing 'radio'                                    OKAY [  6.637s]
Finished. Total time: 7.999s

And booting to recovery image directly doesn't work either, although no error is displayed, I never get to TWRP
Code:
C:\angler-opm7.181205.001>fastboot boot twrp3_1_1_4Cores.img
Sending 'boot.img' (16948 KB)                      OKAY [  0.418s]
Booting                                            OKAY [  0.696s]
Finished. Total time: 1.144s

Any suggestions?
Is it bricked beyond repair?

Thanks
 

Lughnasadh

Senior Member
Mar 23, 2015
3,900
4,166
Google Nexus 5
Huawei Nexus 6P
And flashing recovery fails with Permission denied.

Code:
C:\angler-opm7.181205.001>fastboot flash recover twrp3_1_1_4Cores.img
Sending 'recover' (16948 KB)                       OKAY [  0.496s]
Writing 'recover'                                  FAILED (remote: 'Permission denied!')
fastboot: error: Command failed

As you can see, some partition flashing works just fine
Code:
fastboot flash bootloader bootloader-angler-angler-03.84.img
Sending 'bootloader' (3554 KB)                     OKAY [  0.125s]
Writing 'bootloader'                               OKAY [  0.247s]
Finished. Total time: 0.432s

C:\angler-opm7.181205.001>fastboot reboot-bootloader
Rebooting into bootloader                          OKAY [  0.007s]
Finished. Total time: 0.011s

C:\angler-opm7.181205.001>fastboot flash radio radio-angler-angler-03.88.img
Sending 'radio' (48728 KB)                         OKAY [  1.309s]
Writing 'radio'                                    OKAY [  6.637s]
Finished. Total time: 7.999s

And booting to recovery image directly doesn't work either, although no error is displayed, I never get to TWRP
Code:
C:\angler-opm7.181205.001>fastboot boot twrp3_1_1_4Cores.img
Sending 'boot.img' (16948 KB)                      OKAY [  0.418s]
Booting                                            OKAY [  0.696s]
Finished. Total time: 1.144s

Any suggestions?
Is it bricked beyond repair?

Thanks
I would suggest to make sure your platform tools are up-to-date (30.0.4 is the latest I think) and flash the last factory image (Dec. 2018) with the flash-all command instead of flashing partitions separately. If you have the BLOD it won't boot but then you can apply the fix from the link below, which is the latest and best method. The fix in this thread is outdated.

https://forum.xda-developers.com/nexus-6p/general/bootloop-death-blod-workaround-zip-t3819515
 

badabing2003

Recognized Contributor
Sep 17, 2012
1,003
920
I would suggest to make sure your platform tools are up-to-date (30.0.4 is the latest I think) and flash the last factory image (Dec. 2018) with the flash-all command instead of flashing partitions separately. If you have the BLOD it won't boot but then you can apply the fix from the link below, which is the latest and best method. The fix in this thread is outdated.

https://forum.xda-developers.com/nexus-6p/general/bootloop-death-blod-workaround-zip-t3819515

Thank you for your response Lughnasadh,
I originally started with flash_all as I didn't think it was core issue, and flash_all failed at the boot image writing phase.
Here's the output of it.

Code:
C:\angler-opm7.181205.001>flash-all.bat
Sending 'bootloader' (3554 KB)                     OKAY [  0.125s]
Writing 'bootloader'                               OKAY [  0.248s]
Finished. Total time: 0.427s
Rebooting into bootloader                          OKAY [  0.658s]
Finished. Total time: 0.661s
< waiting for any device >
Sending 'radio' (48728 KB)                         OKAY [  1.304s]
Writing 'radio'                                    OKAY [  6.629s]
Finished. Total time: 8.186s
Rebooting into bootloader                          OKAY [  0.024s]
Finished. Total time: 0.028s
--------------------------------------------
Bootloader Version...: angler-03.84
Baseband Version.....: angler-03.88
Serial Number........: REDACTED
--------------------------------------------
extracting android-info.txt (0 MB) to RAM...
Checking 'product'                                 OKAY [  0.012s]
Checking 'version-bootloader'                      OKAY [  0.011s]
Checking 'version-baseband'                        OKAY [  0.008s]
extracting boot.img (11 MB) to disk... took 0.085s
archive does not contain 'boot.sig'
fastboot: error: Couldn't parse partition size '0x'.
Press any key to exit...

Thanks for the link, I got the files from there, I can flash the twrp recovery
but rebooting to recovery does not bring up twrp, hence can't write the zip file.
It shows the Google logo and then reboots (loop)

Code:
C:\angler-opm7.181205.001>fastboot flash recovery twrp-3.2.1-0-fbe-4core-angler.img
Sending 'recovery' (20448 KB)                      OKAY [  0.507s]
Writing 'recovery'                                 OKAY [  1.119s]
Finished. Total time: 1.686s

C:\angler-opm7.181205.001>fastboot reboot recovery
Rebooting into recovery                            OKAY [  0.006s]
Finished. Total time: 0.010s

That is why I was asking if there was any way to fix the partition tables.
Any suggestion even from the left field is welcome as at this stage, all it is, is a paperweight.

Thanks
BB
 

Lughnasadh

Senior Member
Mar 23, 2015
3,900
4,166
Google Nexus 5
Huawei Nexus 6P
Thank you for your response Lughnasadh,
I originally started with flash_all as I didn't think it was core issue, and flash_all failed at the boot image writing phase.
Here's the output of it.

Code:
C:\angler-opm7.181205.001>flash-all.bat
Sending 'bootloader' (3554 KB)                     OKAY [  0.125s]
Writing 'bootloader'                               OKAY [  0.248s]
Finished. Total time: 0.427s
Rebooting into bootloader                          OKAY [  0.658s]
Finished. Total time: 0.661s
< waiting for any device >
Sending 'radio' (48728 KB)                         OKAY [  1.304s]
Writing 'radio'                                    OKAY [  6.629s]
Finished. Total time: 8.186s
Rebooting into bootloader                          OKAY [  0.024s]
Finished. Total time: 0.028s
--------------------------------------------
Bootloader Version...: angler-03.84
Baseband Version.....: angler-03.88
Serial Number........: REDACTED
--------------------------------------------
extracting android-info.txt (0 MB) to RAM...
Checking 'product'                                 OKAY [  0.012s]
Checking 'version-bootloader'                      OKAY [  0.011s]
Checking 'version-baseband'                        OKAY [  0.008s]
extracting boot.img (11 MB) to disk... took 0.085s
archive does not contain 'boot.sig'
fastboot: error: Couldn't parse partition size '0x'.
Press any key to exit...

Thanks for the link, I got the files from there, I can flash the twrp recovery
but rebooting to recovery does not bring up twrp, hence can't write the zip file.
It shows the Google logo and then reboots (loop)

Code:
C:\angler-opm7.181205.001>fastboot flash recovery twrp-3.2.1-0-fbe-4core-angler.img
Sending 'recovery' (20448 KB)                      OKAY [  0.507s]
Writing 'recovery'                                 OKAY [  1.119s]
Finished. Total time: 1.686s

C:\angler-opm7.181205.001>fastboot reboot recovery
Rebooting into recovery                            OKAY [  0.006s]
Finished. Total time: 0.010s

That is why I was asking if there was any way to fix the partition tables.
Any suggestion even from the left field is welcome as at this stage, all it is, is a paperweight.

Thanks
BB
I think you can use fastboot to format the boot partition (fastboot format boot....I think). You can also get those errors from having outdated or bad platform tools. You can also try using a different cable.

But what concerns me is that you can't boot into TWRP after flashing the 4core TWRP. This usually means that there are other things going on and that likely your phone is dead. Here is a quote from the OP:

"If no 4core recovery boots for you then you definitely have more components than just the performance cores separated, sorry but your device is a brick."
 
Last edited:

badabing2003

Recognized Contributor
Sep 17, 2012
1,003
920
I think you can use fastboot to format the boot partition (fastboot format boot....I think). You can also get those errors from having outdated or bad platform tools. You can also try using a different cable.

But what concerns me is that you can't boot into TWRP after flashing the 4core TWRP. This usually means that there are other things going on and that likely your phone is dead. Here is a quote from the OP:

"If no 4core recovery boots for you then you definitely have more components than just the performance cores separated, sorry but your device is a brick."

Thanks, I was afraid of that, I'm using the latest platform-tools
Code:
fastboot --version
fastboot version 30.0.4-6686687

and formatting boot doesn't work either
Code:
C:\angler-opm7.181205.001>fastboot format boot
fastboot: error: Formatting is not supported for file system with type ''.

I think I need to recreate the partitions, if there are any tools to do that, I might save this
but I don't think fastboot can do that.

Thanks
BB
 

tinyspeck

Member
Jan 4, 2020
9
0
minimal_adb_fastboot_1.4.3_portable is old but it flashes boot.

the newest fastboot returns error about size 0x.

So using newest is not obligatory, but to explain why older or newest, some deeper understanding is needed;)
 

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  • 265
    Read First: This method is relatively drastic, and will hurt device performance some. You should only use this as a last resort, if the more basic methods of fixing a soft brick didn't work (e.g, factory reset, flash stock firmware, etc.)​

    *Update 8/22: Android O is working with 4 Cores now! Big thank you to @xls654 for finding out how to get Android O to work.

    *Petition:
    I made a petition for Google to officially release and sign modified boot.imgs, so that people with locked bootloaders can fix their devices too. Check it out here. (I apologize for dumbing it down so much, I wanted to make sure everyone could understand it)

    *Changelog:

    • 8/25 - EX kernel for Android O added.
    • 8/22 - Android O DPR6 boot.img and source added.
    • 8/16 - Started making this fix open-source, source code section added in OP. Also uploaded modified Franco and Flash kernel & source.
    • 8/10 - Added PA 7.2.2 and DarkROM boot images.
    • 8/08, 2nd change - Uploaded modified boot.img for firmware 48C.
    • 8/08 - Updated EX kernel to version 4.1.2. This updated zip adds the CPU utilization patch to the init.elemntalx.rc, instead of removing the old init.angler.rc and copying the new init over. That should mean more compatibility with Roms/kernels that modify the init.angler.rc. I also modified the camera-daemon to use cpus 0-3 instead of 0-2, so hopefully this should make the a camera bit faster too.
    • 8/07 - Added boot.img that only uses 1 core. Someone suggested I make a boot.img that only uses 1 core, just to see if it works for devices that didn't work with the 4 Core fix.
    • 7/30 - Added universal EX zip, this zip should modify your kernel to use only 4 cores, and it should modify it to utilize all 4 cores. You can flash this over most ROMs and it should work. Also added a donation url, and this changelog.
    • 7/29, 2nd change - Added Pure Nexus and PA dev version boot images, modified to use 4 cores, and utilize all 4.
    • 7/29 - Updated this fix to greatly improve performance. Before this fix, the device was only using 1 core for foreground tasks, now it will use all 4 cores. Also revamped OP.
    • 7/21 - Fix created, stock boot.img, TWRP image, and EX kernel modified to use 4 cores.


    *What this fix does, and how to apply it:

    The problem:
    The problem with most of the devices in a BLOD, is that a hardware failure related to the BIG cluster has occurred. This fix remedies the problem by disabling the BIG cores. Unfortunately, this does mean that you will take a performance hit. However, I am continually working on ways to improve the device's performance.

    The update: If anyone remembers device performance with the first fix, it was hurt a lot, however, after finding out that the device was only using 1 core for all foreground tasks, I modified the ramdisk to utilize all 4 cores more effectively, and it helps a lot.

    Requirements: For this fix to work, you need:
    • A brain
    • A computer
    • A bootlooping 6P with an unlocked bootloader/OEM unlocking enabled
    • The modified files of your choice
    • Fastboot on your computer (preferably installed system wide). If you do not know what this is, or do not have it, look at this post. Answer yes to all of the prompts to install it.

    How to apply the fix:
    1. Boot your phone into bootloader (hold power and volume down).
    2. Connect your phone to the computer.
    3. Go to the folder where you have the modified files, then hold shift and right click in a blank space, click on "open command prompt here" in the menu that pops up.
    4. In the command prompt: type "fastboot flash boot [name of the file here]" and then press enter. If you're flashing TWRP, replace boot with recovery. (Linux users, make sure you're running as root)
      Edit: With the new EX zip, you shouldn't need to flash the boot.img anymore, you can just flash twrp, and then flash EX in twrp.
    5. Boot up your phone, and hopefully it should work!


    *If your phone is bootloader locked/OEM locked:

    You can try to get your phone to boot long enough to enable OEM unlocking. Some users have reported success by freezing their phone for a bit, then booting it. Others have let their battery drain all the way, and then tried to boot their phone, but the most successful method seems to be heating up your phone (a lot).
    If you do attempt any of these methods, make sure you have time and patience, as it will take a long time.

    To enable OEM unlocking and unlock bootloader:
    1. Go to settings.
    2. Go to developer options, if you do not see that, go to "about phone", scroll to build number, and then tap it 7 times. You should now see developer options in settings.
    3. Once you're in developer options, click on "OEM unlocking" and accept the prompt.
    4. Now reboot your phone to bootloader, connect your phone to the computer, and type "fastboot flashing unlock" Your bootloader should now be unlocked.

    *Downloads:

    • Boot.img from stock 6.17, 8.0 firmware: Download | Mirror. This Image is the from the first official release of Android O, and is modified to use 4 cores. It also disables forced encryption as a bonus. Thank you to @xls654 for figuring out how to get Android O to work.
    • Boot.img from stock 48C, 7.1.2 firmware: Download | Mirror. This Image is modified to use only 4 cores, and is modified to utilize the 4 cores more effectively. I have had multiple people say that first boot takes a while after flashing this, so just wait about 20 minutes before you declare something is wrong with it.
    • Boot.img from stock 48B, 7.1.2 firmware: Download |Mirror. This Image is modified to use only 4 cores, and is modified to utilize the 4 cores more effectively. I have had multiple people say that first boot takes a while after flashing this, so just wait about 20 minutes before you declare something is wrong with it.
    • TWRP version 3.1.1: Download | Mirror. This TWRP image is modified to use only 4 cores.
    • EX kernel version 5.03: Download | Mirror. EX kernel 5.03 works with android 8.0.0. This zip applies the 4 cores patch, but you will need to flash it over an already modified boot.img to work.
    • Elemental X kernel version 4.12, universal zip: Download | Mirror. This zip is EX kernel, modified to use only 4 cores. Update: I modified it to apply the CPU utilization patch too, so now this is a universal zip, flash it over almost any ROM, and you should now have the BIG cores disabled fix, and the little core utilization fix.
    • Flash kernel version 2.5: Download | Mirror. This zip is modified to use only 4 cores, and utilize all 4. Works with android 7.1.2. You can flash this over almost any ROM, including stock, and it should boot again.
    • Franco kernel r55: Download | Mirror. This zip is modified to use only 4 cores, and utilize all 4. Works with android 7.1.2. You can flash this over almost any ROM, including stock, and it should boot again.

    You will most likely not need these images. It will be much easier, and much more universal to flash one of the custom kernel zips above ^^^
    • PA boot.img from PA version 7.2.2, build 8/10: Download | Mirror. Uses only 4 cores, and has core utilization patch.
    • PA boot.img from PA version 7.2.1: Download | Mirror. Boot.img from PA dev preview 7.2.1, uses only 4 cores, and is modified to utilize 4 cores more effectively. Flash it after you flash the PA zip, either with fastboot, or TWRP image flash.
    • Pure Nexus boot.img from Pure Nexus 7/25 build Download | Mirror. This image is modified to use only 4 cores, and it has a tweak to utilize the 4 cores more effectively. Flash it after you flash Pure Nexus, either with fastboot, or TWRP image flash.
    • DarkROM boot.img from 7/21 build: Download | Mirror. This image is modified to use only 4 cores, and has the utilization patch.
    • Boot.img modified to use only 1 Core. Some people were reporting that the 4 core images weren't working for them, someone suggested that I make a 1 core version to see if that helps at all. Edit: seems not to help unfortunately. Here it is: Download | Mirror


    Unfortunately, I have not been able to get Android O working yet, but I am working on it right now.
    If you have a favorite custom ROM or kernel you want to ported over to use 4 cores, let me know, and I'll put it up.


    *Source code:



    p-0000000000000000000000000000007 (sorry that was my kitten)

    *Tested custom ROMS/kernels

    I have used Pure Nexus by flashing the modified EX zip over it, it has notably better performance than the stock ROM, and very good battery life. It's a clean, stable ROM, with plenty of good features that are actually useful.
    I have also used Paranoid android dev preview, very good performance, definitely my favorite as of now. Battery life leaves something to be desired, but I have not tried a custom kernel yet. Also, 7.2.1 seemed smoother to me than 7.2.2.

    If you have a custom ROM/kernel that worked for you, let me know and I'll put it up here.


    *To improve performance slightly:

    • Flash a custom kernel. I will upload more kernels as I test more, so stay tuned.
    • Overclock the little cores. It can slightly help offset the lost performance, on my 6P, I have mine overclocked to 1632MHz, and it works perfectly for me. Edit: I actually recommend not overclocking. Many people have reported their Little cores failing, so I would go for longevity on this device, and keep it at stock clocks, or even underclock it. The speed difference you get from overclocking is negligible anyways.
    • Disable animations in developer options. Seriously, as soon as I found out about this tweak, I've used it on ever single device I've owned, it helps a ton.
    • Turn resolution down to 1080p. On a small screen, the difference in between 1080p and 1440p is not very noticable. To do this, first get root access, then download a terminal emulator. In the terminal, type "su" and grant it root access, then type "wm size 1080x1920", and finally, change the density "wm density 400". Personally, I like my density at 400, but you can expieriment with it. Lower density=Smaller items and text, Higher density=Bigger items and text. Also @Adithya FRK mentioned that you also want to put density in build.prop so apps display correctly. Change ro.sf.lcd_density=560 to your density, if you changed it.


    *Credits:

    @rchtk, His post here gave me the idea for how to modify the images.
    @flar2, He built the Elemental X kernel for this device, I merely made a small modification to his kernel to use 4 cores. In no way am I trying to steal and/or discredit his work.
    The TWRP development team, they built the TWRP recovery for this device, I merely made a small modification to their recovery to use 4 cores. In no way am I trying to steal and/or discredit their work.
    @tr1gg3r.man, He made the the PA kernel, I just added a couple modifications. In no way am I trying to steal and/or discredit his work.
    @BeansTown106, He made the Pure Nexus kernel, I just added a couple modifications. In no way am I trying to steal and/or discredit his work.
    @Dark_Eyes_, He made the DarkROM kernel, I just added a couple modifications to it. In no way am I trying to steal and/or discredit his work.
    @[U][COLOR="Purple"]The Flash[/COLOR][/U], He made The Flash kernel, I just made a couple modifications to it. In no way am I trying to steal and/or discredit his work. His posts have also helped me a lot with learning how to build a kernel from source, understanding how to use git more, etc. I recommend you check them out if you are interested in getting started with android development.
    @[B]franciscofranco[/B], He made Franco kernel, I just made a couple modifications to it. In no way am I trying to steal and/or discredit his work.
    @xls654, He found out how to get Android O working with 4 cores.


    FAQs

    • What's the password for TWRP/Why is TWRP asking for a password? - In android 7.0, Google added forced encryption to the data partition. To get around this, click cancel when TWRP asks you for a password, and then factory reset the device. Then you can flash EX kernel/Magisk to disable forced encryption.
    • Why am I getting an error when I try to flash the images? - Your bootloader is probably not unlocked, try running the command "fastboot flashing unlock", If you get an error there too, then you will have to enable OEM unlocking before you can continue.
    • It's not working for me, how do I fix it? - My only advice for that is: "Flash the stock firmware for whatever version image you're trying to flash, then reflash the images again" If you're stuck on the boot animation, wait at least 20 minutes before you declare it's not working. If none of that works, chances are your device may have a different problem.
    • Does EX kernel have the new speed fix? - Yep, you can flash this over just about any ROM, and it should patch it to use only 4 cores, and use them well.


    I would like to help as many people as I can, however, I am much more likely to be able to easily help you/reply to your post if you clearly state your problem and the steps you attempted to fix it. I will be much less likely to reply to posts such as "omggg i flashed the image and my phone won't boot helppp" Please read through post first, I did not spend time typing up this OP for no one to read it. If I can see that you read through the OP and have attempted all the steps, then I will be much more willing to help you.

    I set up donations on my profile, for those of you who want to donate. I have spent countless hours modifying, flashing, testing, and helping, don't get me wrong, I love doing this and helping y'all out, but donations really keep me motivated to keep going, and donations also will help me fund new equipment and devices that will help further my android development. Every single donation is appreciated :) Donate to me here!

    If this guide helped you, please click thanks, it means a lot to me :)
    25
    Guys.. bad news.. my Nexus 5X just got hit with the BLOD. 😢

    Good news for everyone is I spent a bit of time tonight to first patch the latest TWRP 3.2.1-0-FBE (File-Based Encryption support) image to be 4core, then made an AnyKernel2 zip which will patch the existing boot and recovery partitions on-device to add all the 4core fixes from @XCnathan32. Should work over any ROM, any custom kernel, recovery, etc., can be added in queue after ROM, root zip + custom kernel to patch it from TWRP or FlashFire (so good for OTAs), and simplifies the initial process greatly since you can now fastboot boot any 4core recovery.img and then adb sideload my AK2 zip to fix the likely newer recovery you already had on your device. 👍


    Edit: See my new thread for updated files + step-by-step instructions: https://forum.xda-developers.com/nexus-6p/general/bootloop-death-blod-workaround-zip-t3819515
    17
    How the fuuuuuuuu man you save me, how do you make this.
    Really work for my Nexus 6p thank you man, is there any way to send a cup of coffe.

    To anyone who wants to make a boot.img with 4 cores: It's actually fairly simple, you need to get abootimg tools on linux. Then unpack the boot.img with abootimg -x (name of your boot.img) Once the image is extracted, there should be a file named bootimg.cfg, edit that file and put in maxcpus=4 in the line that starts with cmdline =. Then repack the image with abootimg --create myboot.img -f bootimg.cfg -k zImage -r initrd.img And viola! You have a (half) working kernel.
    17
    Update: Just found out that the kernel is setting foreground tasks to only run on CPU 0, I would assume this is because that foreground tasks only ran on BIG cores, but since the kernel can't access them, it pushes all foreground tasks to CPU 0, and only CPU 0, obviously, this would slow device performance down a lot, so I'm working on building a modified init script to fix this. Up to this point, our devices have basically been running on 1 core, so this fix will help performance a ton.

    I uploaded a screenshot of core usage on device startup, to show just how bad the problem is. (Keep in mind this is on my device with all the tweaks as well)
    16
    Big Update: Got the kernel to start utilizing all 4 of the cores instead of just 1, will update OP with links shortly! I haven't tested it much, as I just got it working, however, I expect a drastic increase in performance.
    Also, does anyone know how to add spoilers? I seriously need to clean up my OP.

    Edit: Yep, even from just a couple minutes of testing, device runs smooth AF now, and that was at startup too, when it's typically extremely laggy.

    I attached a screenshot of all cores being used down below.