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

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Jan 13, 2018
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Okay, let's be sure to clarify something, when the phone is in 'fastboot mode', adb will not see it. That is not adb mode. The only time adb will see the phone is when it's booted and you've turned on adb debugging in developer options.

If you have twrp, adb will see it then also, but that's a bit more advanced.

Be sure the device is in fastboot and connected, see if you can get drivers installed and the 'fastboot devices' sees the phone.
Now I feel like a dumbass. I was thinking I had to use the terminal in the folder...
 
Jan 13, 2018
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Okay, let's be sure to clarify something, when the phone is in 'fastboot mode', adb will not see it. That is not adb mode. The only time adb will see the phone is when it's booted and you've turned on adb debugging in developer options.

If you have twrp, adb will see it then also, but that's a bit more advanced.

Be sure the device is in fastboot and connected, see if you can get drivers installed and the 'fastboot devices' sees the phone.
Alright so I got it unlocked, trying to use magisk however to patch the bin file I moved isn't working. Unsupported/unknown image, and it failed
 

AsItLies

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Nov 4, 2009
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Alright so I got it unlocked, trying to use magisk however to patch the bin file I moved isn't working. Unsupported/unknown image, and it failed

okay good, progress. Again to clarify, the G8 is a newer device and getting root / magisk is different than it's been in the past.

One option is to simply find the boot image that already has magisk 'ramdisk injected' into it. They are available on tele group, don't remember the name of the group but if you search there for it can probably find it.

Another option is to do as it sounds like yer trying, but it's hard to know what's wrong from your description, if you have the magisk manager installed and trying to patch it, it may be the saved off image you got from qfil doesn't have the correct name extension magisk needs?

just rename it if that's the case.
 
Jan 13, 2018
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okay good, progress. Again to clarify, the G8 is a newer device and getting root / magisk is different than it's been in the past.

One option is to simply find the boot image that already has magisk 'ramdisk injected' into it. They are available on tele group, don't remember the name of the group but if you search there for it can probably find it.

Another option is to do as it sounds like yer trying, but it's hard to know what's wrong from your description, if you have the magisk manager installed and trying to patch it, it may be the saved off image you got from qfil doesn't have the correct name extension magisk needs?

just rename it if that's the case.
Not seeing any img files. I didn't do anything to the original bins. And I tried to replace the extension of the bin file I moved to my phone with IMG but it seems magisk isn't impressed.



I decided to enter edl and use QFIL to snag the boot_B since its the slot my phone is on. Looks like it worked. ONWARDS!
 
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okay good, progress. Again to clarify, the G8 is a newer device and getting root / magisk is different than it's been in the past.

One option is to simply find the boot image that already has magisk 'ramdisk injected' into it. They are available on tele group, don't remember the name of the group but if you search there for it can probably find it.

Another option is to do as it sounds like yer trying, but it's hard to know what's wrong from your description, if you have the magisk manager installed and trying to patch it, it may be the saved off image you got from qfil doesn't have the correct name extension magisk needs?

So I ****ed up by not flashing the mgisk zip for twrp before going through the factory reset. HEEELLLLLLLLPPPPPPPPPPPPPPPPPPPPPPPPPP



Nvm. Entered EDL and reflashed the modified img. Whew
 
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Completely out of ideas here. And I am unsure why this happens when I try to manually update.
 

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Great now for some random ass reason some apps' bluetooth wont connect, but lets me connect my earbuds!


EDIT: fixed it. I swear, I am not going any further past rooting, am not comfortable ****ing around with flashing since it took this damn long to fix everything.
 
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AsItLies

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Nov 4, 2009
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Samsung Galaxy S10
Great now for some random ass reason some apps' bluetooth wont connect, but lets me connect my earbuds!


EDIT: fixed it. I swear, I am not going any further past rooting, am not comfortable ****ing around with flashing since it took this damn long to fix everything.
This is how we learn bro, this is how we learn. It's fun, but don't burn yerself out.

Cheers
 
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    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.
    6
    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.


    Maybe I'm not catching on to something but, following the guide I don't have a abl_b.bin file besides the one backed up.
    There was a link provided for an abl_a.bin file.
    What am I not understanding?

    Okay I got it this morning. Reread it still didn't understand but had some hunches so check around the net about LG dual sim unlocking and then it clicked. It was meant to say load the engineering file provided into both abl_a and abl_b

    Thanks for the guide maybe rephrase that part. I was super confused for a bit, would never overwrite something with a different name without being super clear.
    6
    Success!

    I have a G8 (LM-G820TM, US T-Mobile variant) that had been updated OTA to Android 11 (G820TM30b). I used Windows 10 Pro 64-bit, version 21H2, on a Dell Latitude E6230 (That shouldn't matter, but is provided for reference).

    Some notes for anyone else doing this, and wisdom I got from more experienced commenters in this thread:

    • Read all the instructions carefully. Read every word slowly. Do what you need to do to make sure you don't skip any steps. If necessary, print out the instructions and cross them off one by one.

    • EDL Mode doesn't show anything on the screen. You'll only know if your phone is in EDL mode if your computer makes a USB Connected chime, and it shows up under Ports in Device Manager.

    • Use a good quality USB 2.0 cable and USB 2.0 port. QFIL is finicky, and doesn't like USB 3 ports. If you get a Sahara error, use a different cable, a different port, or a different computer.

    • When you back up your abl_a and abl_b partitions, they should be about 1MB. (1024KB exactly, in my case). If they're significantly larger, then they didn't read correctly. You'll need to flash them back later, and if they didn't read correctly, you can't restore them.

    • The provided engineering abl_a should be flashed to abl_a and abl_b.

    • The engineering abl should only be used to enable fastboot temporarily so that you can unlock the bootloader. You can't leave it there - you have to flash your original abl_a and abl_b back to your phone once the bootloader is unlocked. If you leave the engineering abl on there, you'll either get a bootloop or your touchscreen won't work.

    • When booting into fastboot for the first time, Windows doesn't use the correct (or any) driver, so the phone just shows up as "Android" in Device Manager, and it doesn't show up when you do "fastboot devices". I had the LG Mobile Driver installed per the instructions, so it was just a matter of pointing Windows at the correct driver. In Windows 10 it was Update Drivers -> Browse my computer for drivers -> Let me pick from a list of available drivers on my computer -> Android -> LGE Mobile ADB Interface
    5
    It should since the abl used is from a g8x and it worked on my v50 sprint.. :)
    4
    Ok, so maybe you unlocked the bootloader, still not sure. But you didn't even root? How do you consider this a success then?

    Well, to answer the first part of your response here are a couple images (jpg type)

    And for the rest of your response, I am going to try to finish out this tutorial this morning. I can say this much in advance: I have found that once a phone has been bootloader unlocked, gaining root (whether it be by magisk, the ol' SuperSU, or whatever) becomes an eventuality of overwhelmingly high likelihood of success. I am saying 'high likelihood' only because I realize that there are never any absolute guarantees in XDA, and it's not a good idea to jinx yourself by getting overconfident. So I'm gonna try to get rooted here and keep my fingers crossed, but I personally can not recall ever hearing of a phone whose bootloader is unlocked, that couldn't be rooted.
    v50thinQ.jpg
    v50thinq2.jpg