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

Seasee606 said:

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:

LG Mobile Drivers and Software | LG USA Support

LG Mobile Drivers and Software. Learn how to use, update, maintain and troubleshoot your LG devices and appliances.

www.lg.com

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


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#)
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.
Click Tools > Partition Manager.
Find Abl_a and right click on it and select Manage Partition Data. Click Read to backup your abl_a.
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

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.
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.

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.
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
Reboot back to the Bootloader. Unplug your phone, Power off, Hold Vol-, then Plug it in.
Your phone should say Device State – unlocked now


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.

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