Guide LG G8/G8x/v50 Bootloader Unlock and Magisk Root using Firehose

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blaze2051

Senior Member
Jul 26, 2010
122
11
LG G7 ThinQ
LG V40
So friends, someone knows how to resurrect the touchscreen?
you have to flash your stock backed up abl a and abl b to get touch to work again.

you can not stay on the v50 eng abl a because of touch screen driver is off. you may try this guide but i have not tried it.

 

Keke.ua

Member
Nov 2, 2020
25
3
Kharkiv, Ukraine
LG G8



here some links in case someone new comes along
Click Tools> Partition Manager. Find Abl_a and right click on it and select Manage Partition Data. Click Read to backup your abl_a. I correctly understand under the saved abl_a / b you mean this action? if so, then I have already re-loaded them via qfil but it did not work. maybe you need to lock the bootloader and then recover? sorry for my importunity, but I don’t know what to do anymore. And why do I need that manual with fingerprint recovery? maybe I'm stupid, but I don't see any useful information there on how to restore a touchscreen and not a fingerprint
 

blaze2051

Senior Member
Jul 26, 2010
122
11
LG G7 ThinQ
LG V40
Click Tools> Partition Manager. Find Abl_a and right click on it and select Manage Partition Data. Click Read to backup your abl_a. I correctly understand under the saved abl_a / b you mean this action? if so, then I have already re-loaded them via qfil but it did not work. maybe you need to lock the bootloader and then recover? sorry for my importunity, but I don’t know what to do anymore. And why do I need that manual with fingerprint recovery? maybe I'm stupid, but I don't see any useful information there on how to restore a touchscreen and not a fingerprint
flashing your stock abl a/b should have restored your touch screen if it did not work then you need to flash a complete new .kdz file using LGUP 1.14
 

Keke.ua

Member
Nov 2, 2020
25
3
Kharkiv, Ukraine
LG G8
вы должны прошить свои акции резервными копиями abl a и abl b, чтобы снова получить связь.

вы не можете оставаться на v50 eng abl a из-за того, что драйвер сенсорного экрана выключен. вы можете попробовать это руководство, но я его еще не пробовал.

[/Цитата]
stop, judging by the video, should I restore the abl_b section with the saved abl_a.bin?
 

bambi007

Member
Apr 14, 2010
41
4
so if I am on 10e with my lg 8gx is it possible to downgrade via "lg up 1.14" and downloading a 10d firmware
from the official lg webpage for my phone?
Or is there a bricking risk by downgrading?
 

justanutt

Senior Member
Apr 10, 2013
81
21
so if I am on 10e with my lg 8gx is it possible to downgrade via "lg up 1.14" and downloading a 10d firmware
from the official lg webpage for my phone?
Or is there a bricking risk by downgrading?
In my experience flashing with lgup is pretty reliable. But this last time it was not. You technically should be able to. Just make sure you make a backup of your current firmware first!!!
 

Keke.ua

Member
Nov 2, 2020
25
3
Kharkiv, Ukraine
LG G8
"Пожар2051, No 84583319, No 2779750"
Квинси Промес, ЛГУП 1,14
ВОПРОС/ВОПРОС А́
"ВОПРОС"blaze2051, сообщение: 84584489, член: 2779750""
еще одна полезная ссылка, если причиной вы можете войти в режим EDL

«URL unfurl»«истинно»»https://forum.xda-разработчики.com/...e-in-9008-mode-without-any-boxes.4052841//URL
(/ЦИТАТА)

Похоже, у меня есть какие-то проблемы с abl_a / б, которые я сохранил на первой загрузки. после загрузки их черный экран. Пожалуйста, пожалуйста, на колени, сделать кого-то резервного abl_a abl_b lg g8 спринт!
 

Mariner_1712

Senior Member
Feb 20, 2014
136
17
Okay, I made it all the way to the ADB step and it flat out refuses to work. At all. Nothing happens when I hit fastboot devices when running the command prompt. When I leave EDL mode, the touchscreen refuses to work. I restored the original files and the phone is back to stock again, but that's not very helpful.


Running a Verizon G8 ThinQ, 20e.
 
Last edited:

Keke.ua

Member
Nov 2, 2020
25
3
Kharkiv, Ukraine
LG G8
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johnnycm77

Senior Member
Oct 3, 2010
87
4
43
candler
LG Wing
I'm in serious need of help. I was able to flash my abl and flash the boot but not able to get into fashion. Now my phone just is just stuck at the Verizon white screen. How can I get into fastboot to finish. I have the LM-G820UM20i from Verizon. LG G8 thinq. Thanks
 

Mariner_1712

Senior Member
Feb 20, 2014
136
17
This absolutely FAILS at the ADB step. I can get ADB to send a reboot command using the stock abl files, but I cannot get anything using the fastboot commands to run.
 

justanutt

Senior Member
Apr 10, 2013
81
21
I'm in serious need of help. I was able to flash my abl and flash the boot but not able to get into fashion. Now my phone just is just stuck at the Verizon white screen. How can I get into fastboot to finish. I have the LM-G820UM20i from Verizon. LG G8 thinq. Thanks
I'm stuck at the same spot. I went back and flashed the eng. abl. I boot into download mode and the phone has different text in the box, letting me power down from the download mode. I'm going to try to flash 20e after I get it downloaded.
 

justanutt

Senior Member
Apr 10, 2013
81
21
IMG_20210303_170437.jpg Now it will not do it.
 
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  • 1
    I am having the same problem. I cant go into fastboot to check the active slot either. I tried the button combo and also the vol- and usb combo. Cant access fast boot. Everytime i try to flash the magisk patched file, it causes me to go into boot loop. I had it rooted before but tried using TWRP to format data and do the dm-verity disable and then it bricked so i had to reflash my original boot_b. Any ideas?
    fastboot only shows up when you are using abl engineering, reflash it and shutdown the phone totally, hold down volume and plug usb type c cable, fastboot will show up
    1
    Does anyone know of a root explorer that works with LG phones, allows read/write not just read
    Yeah, "Root Explorer"
  • 30
    Disclaimer: I am not responsible for any problems from using this guide.
    Works for G8, G8s, G8x, and v50
    Confirmed working on G8 and v50

    Requirements: Android 10

    QFIL: https://drive.google.com/file/d/1P7uGjIirqGRdkwlxgKf_idepDlv6_u-q/view?usp=sharing
    QFIL Driver: https://drive.google.com/file/d/1sPJm1RuSoVX9JMEs-Gx8xNuEDadO6rpj/view?usp=sharing
    LG Mobile Driver:
    ADB: https://drive.google.com/file/d/1nvlwaicFpDN_4DGR0BZRWUDgwQwYzOhS/view?usp=sharing
    Firehose: https://drive.google.com/file/d/1ekI_d2-P9GdoakkSgk2hK1WHbQLIPlTQ/view?usp=sharing
    abl: https://drive.google.com/file/d/1sye4gXsDfD8JVF5qfAMG_GDxSLKY6J6Q/view?usp=sharing

    Verizon LG G8 only frp: https://drive.google.com/file/d/1294cXerj2_EkeGw1p38CcVPuyRfdS9N5/view?usp=sharing
    This Verizon FRP img was only tested on LG G8 Verizon and is not recommended to be used on other Verizon Variants as it will prevent the phone from booting.

    Bootloader Unlock
    Unlocking your bootloader will erase all data on your phone

    First Install LG Mobile Driver, QFIL driver, and QFIL (Select first option, WWAN)

    All Variants other than Verizon: Go to Settings, > System > About Phone > Software Info > Tap Build Number 7 Times.
    Go back to Settings > System > Developer Options. Check Enable OEM Unlock
    Enable OEM Unlock.jpg


    Boot you phone into EDL
    You can make sure that your phone is in EDL by plugging your phone to your pc and checking the Device Manager > Ports > Qualcom HS-USB QDLoader 9008 (COM#)
    Device Manager - Ports.jpg
    Hold Vol- and Power, when the phone screen turns off to restart begin quickly pressing the vol+ but keep holding vol- and power.
    Here is a youtube video of how to boot to EDL:

    Open QFIL, Select your Phone's Port, Select Flat Build under Select Build Type, Select the Firehose.elf file under Select Programmer, on the bottom right of QFIL select UFS as the Storage Type.
    QFIL.jpg
    Click Tools > Partition Manager.
    Find Abl_a and right click on it and select Manage Partition Data. Click Read to backup your abl_a.
    right click manage partition data.jpg
    Go to Windows Explorer and go to C:\Users\Username\AppData\Roaming\Qualcomm\QFIL\COMPORT#
    Rename your ReadData_ufs_Lun4.bin to abl_a.bin
    change readdata to abl.jpg

    Do the same with abl_b, boot_a, and boot_b.
    Boot_a and Boot_b is for Magisk Root. Skip if you only want Bootloader Unlock.
    abl a and b finished.jpg
    Close Partition Manager. Your phone will reboot to EDL on its own after pressing OK. Wait on that.

    Go back to Partition Manager and right click on abl_a again then select Manage Partition Data, then Select Load and choose the abl engineering file.
    Do the same for abl_b.
    Close Partition Manager. Your phone will reboot to EDL on its own after pressing OK. Wait on that.

    Reboot to Fastboot. Hold Vol- and Power then release power when reboot starts and keep holding vol-
    If that doesn't work unplug and Power off your phone. Hold vol- and plug it in. It should go into fastboot.
    Once your phone is in Fastboot it should say
    Device State: Locked and Active A/B Slot - _a or _b
    remember whichever slot your device says and stay on that slot, you may risk bricking if you change to the other slot. You also need this for Root later.
    Fastboot Bootloader Locked and Slot.jpg

    Extract the ADB.zip
    open a Command Prompt and change the directory to the adb folder you just extracted
    cd C:\adb
    run fastboot devices in that command prompt. it should show "LMG850UM fastboot"

    Move the backed up abl_a.bin and abl_b.bin to the adb folder, also frp_verizon.img if you have the verizon LG G8.
    Move abl a and b to adb folder.jpg
    Verizon LG G8 only: Run fastboot flash frp frp_verizon.img then fastboot reboot-bootloader

    Reboot to Fastboot. Hold Vol- and Power then release power when reboot starts and keep holding vol-
    If that doesn't work unplug and Power off your phone. Hold vol- and plug it in. It should go into fastboot.
    Run fastboot oem unlock
    Select Unlock The Bootloader with your arrow keys and press the Power Button
    BL Unlock NoYes.jpg
    Reboot back to the Bootloader. Unplug your phone, Power off, Hold Vol-, then Plug it in.
    Your phone should say Device State – unlocked now
    Fastboot Bootloader Unlocked and Slot.jpg


    Now fastboot flash abl_a abl_a.bin
    and fastboot flash abl_b abl_b.bin
    Finish with fastboot reboot
    Your Phone Is now Bootloader Unlocked.





    Magisk Root
    Only do this after you have followed the above guide and have Unlocked your Bootloader.


    Magisk
    Xda Forum: https://forum.xda-developers.com/f/magisk.5903/
    Xda Thread: https://forum.xda-developers.com/t/magisk-the-magic-mask-for-android.3473445/
    Github Page: https://github.com/topjohnwu/Magisk


    Find the slot you are on from the fastboot bootloader earlier
    Go to Windows Explorer and go to C:\Users\Username\AppData\Roaming\Qualcomm\QFIL\COMPORT#
    Transfer to your phone the boot_a.bin or boot_b.bin that you backed up in the COMPORT# folder.

    Download and install Magisk Manager.
    Open Magisk Manager and beside Magisk hit "Install" then "Select and Patch a File" and select the boot_a.bin or boot_b.bin.
    After Magisk has patched your boot img you should have magisk_patched#####.img in your phones Download folder.
    Transfer it to your PC.

    Reboot to EDL
    Open QFIL. Click Tools > Partition Manager.
    Find the slot you are on from the fastboot bootloader earlier and right click on either boot_a or boot_b and select Manage Partition Data.
    Click Load and select the magisk_patched#####.img file you transfered from your phone.
    Wait for it to finish then Close Partition Manager. Your phone will reboot to EDL on its own after pressing OK. Wait on that.

    Reboot to System by holding vol- and power till your phone reboots out of EDL then release both.
    Your phone is now Bootloader Unlocked with Magisk Root.






    Hopefully this helps.
    This guide was written by me, but the information was provided by Cloud1250000.
    If there are any errors let me know and I will fix.
    3
    can't access download mode. getting waring that the phone didn't pass safety check and keeps on booting to fastboot mode. any help will be greatly appreciated. was trying to root and this happened. bootloader is unlocked. can access fastboot but no download mode. V500N


    I had similar experience, it's just a lil tricky. I found it was easiest to boot phone completely, plug into computer, you hear the pc chime when phone is recognized, at that point hold the vol - and power until the pc chimes the disconnect, then immediately release the power button and tap the vol + repeatedly (usually 1-3 times) until the PC chimes connected, this all while still holding vol -. Practice how to hold the phone, release power and tap a few time and then it was easy.
    2
    It should since the abl used is from a g8x and it worked on my v50 sprint.. :)
    2
    My experience was Nothing like yours. I had a stock v50. In the thread I linked they did discuss the touch functionality in twrp. I launch recovery from vol - and power buttons and touch control was fine. The only thing worthy of comment from my point of view was, after twrp install I had to re-root through magisk manager and QFIL.
    Touch in TWRP only work when booting using the button combo :)
    2
    thanks for reply
    my devices: lg g8 sprint g820u21d
    i think i solved it, just restore the abl_a and abl_b but my device doesnt have root. i follow magisk root step , try many time but no luck.

    edit: Finally i dit it !!

    Yeah who would have thought it was important to follow all the steps...
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