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

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Tugboat Tony

Member
Apr 26, 2010
19
9
Android 10
Baseband version: MPSS.HE.1.0c4-00090-SIM8150_GEN_PACK-1
Kernel: 4.14.117
Build number: QKQ1.190929.002
Software version: G820U21b

When you say install the other version... is there more than on application in the download file? I only see one.
 
T

timecutter

Member
Jun 2, 2017
15
13
LG mobile drivers taken down by google. I found lg mobile drivers and it works in adb however fastboot doesn't see any devices. Was able to write original abl_a & b back using qfil so all is well. LM-G820UM G820UM20i, official, qkq1.190929.002. Windows 10
 
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B

bexiu

Member
Mar 14, 2018
28
4
my phone AT&T, software version G820UM10g, android 9, android security patch level: march 1, 2019. Can you mind recommend me how to root follow your guiding? I want to stay on android 9.
update::eek:
I follow this, and it stucked on logo after flash abl_a, abl_b. Maybe firehose cause this problem because my android still 9.
Any help me out this stuck logo, please!
 
Last edited:
M

mc_365

Senior Member
Sep 17, 2009
367
63
Jersey City
Seasee606 said:
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.
Click to expand...
Click to collapse

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?
 
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Shaglo

Shaglo

Member
Feb 7, 2021
5
3
Hi, first of all thank you for your post. I managed to unlock bootloader and install magisk using method you provided. However I ran to a problem when I set-up a security lock screen the device will go into bootloop when restarted. Is there anyway to fix this?
 
O

OGPunc

New member
Jun 19, 2013
4
1
Is this safe to try on Canadian G8? Would anything be different? Will this enable custom Roms too once recoveries and roms are available? Should I double check anything first like partitions? Any info would be great been waiting for root forever.
 
justanutt

justanutt

Senior Member
Apr 10, 2013
138
42
OnePlus 11
I have a LgG8 verizon model with 20i stock installed.
I get to this part ...


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.

...and I cannot get the frp_verizon.img to flash over. It says that there is not a file with that name.

Do I need to downgrade first?
 
M

mc_365

Senior Member
Sep 17, 2009
367
63
Jersey City
Seasee606 said:
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.
Click to expand...
Click to collapse


mc_365 said:
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?
Click to expand...
Click to collapse

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.
 
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Shaglo

Shaglo

Member
Feb 7, 2021
5
3
mc_365 said:
Follow the directions, when finished redo your magisk same as the last rooting steps in this thread.
Click to expand...
Click to collapse
Hey after failed attempt to get Magisk working with lockscreen I tried the method of installing twrp. I managed to install the twrp, but touchscreen wouldnt work with twrp unless I hard reset the device. But even after hard reset, rebooting back to twrp will cause touchscreen not working again. Also I got a decryption issue with the twrp and 'solving' it causes me to bootloop. Btw I managed to fix both bootloops by recovering my boot_b in QFIL in case anybody had the same problem. How was it in your end with magisk and twrp?
 
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M

mc_365

Senior Member
Sep 17, 2009
367
63
Jersey City
Shaglo said:
Hey after failed attempt to get Magisk working with lockscreen I tried the method of installing twrp. I managed to install the twrp, but touchscreen wouldnt work with twrp unless I hard reset the device. But even after hard reset, rebooting back to twrp will cause touchscreen not working again. Also I got a decryption issue with the twrp and 'solving' it causes me to bootloop. Btw I managed to fix both bootloops by recovering my boot_b in QFIL in case anybody had the same problem. How was it in your end with magisk and twrp?
Click to expand...
Click to collapse

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.
 
Last edited:
d3vils2

d3vils2

New member
Jan 16, 2021
2
0
It already works on LG v50n. but i can't find magisk_patched #####. img and twrp any for my phone
 
C

cloud1250000

Senior Member
Jul 4, 2011
445
179
Ottawa
mc_365 said:
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.
Click to expand...
Click to collapse
Touch in TWRP only work when booting using the button combo :)
 
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S

sinkoo1979

Senior Member
Oct 29, 2016
745
129
Yigo
T-Mobile Samsung Galaxy S5
LG G3
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
 
M

mc_365

Senior Member
Sep 17, 2009
367
63
Jersey City
sinkoo1979 said:
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
Click to expand...
Click to collapse


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.
 
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  • 1
    RenardHCRc
    RenardHCRc
    xpedro said:
    black screen. i managed to use fastboot, and unlocked the bootloader. i was missing a driver that i found on xda. now i have to pass the patched magisk boot img, but qfil stopped working. i think i'll have to revert the drivers now lol.
    Click to expand...
    Click to collapse
    good. little by little. I struggled a little with my Velvet but in the end it's possible 👍🏻
    View
    1
    RenardHCRc
    RenardHCRc
    xpedro said:
    this is so annoying. i managed to unlock the bootloader of my v50s (korean), but now i can't get into fastboot mode to verify which partition i am using, and besides that i can't make qfil work again (sahara error). is there a different method to enter fastboot mode after unlocking the bootloader?
    Click to expand...
    Click to collapse
    When it was my turn on the LG Velvet (845) I couldn't get back into fastboot mode. I did it by reaping. As for the partitions, I did it on both now, as for modifying the boot.ing file with magisk, only do it on one in my case on "A" because if you do it on both, the OS tends to crash (closing applications , and a lot of lags).
    There is also a command by "CMD" that allows you to see the status of the bootloader, and in the system "activate OEM unlock" appears disabled (it does not allow modification). Try to back up all the files you modify. and the error that appears "Sahara" in my case I had to reinstall drivers and restart the PC. Also the phone restarts and I try until the PC recognizes it as 9008.
    View
    1
    RenardHCRc
    RenardHCRc
    xpedro said:
    now i am rooted, but still can't figure out how to get into fastboot mode to flash lineageos. did you manage to get into fastboot after unlocking bootloader and rooting?
    Click to expand...
    Click to collapse
    If you can't with the key combination, try from "CMD" with the command "Fastboot boot recovery ×××.img" You have to do this when the screen is black 9008. You can also try with "Fastboot Flash recovery ×× ×.img" but that replaces the original recovery so I recommend making a backup. On LG it is sometimes difficult to enter the custom recovery so concmd is the fastest method. This is what I do with my: Mi mix 2s, Mi 11 and previously the LG V50.
    On the V50 there was a key combination to start the custom recovery. . . . I'm going to investigate again to see if I can find it since I had it years ago.
    View
    1
    Surgemanxx
    Surgemanxx
    xpedro said:
    now i am rooted, but still can't figure out how to get into fastboot mode to flash lineageos. did you manage to get into fastboot after unlocking bootloader and rooting?
    Click to expand...
    Click to collapse
    Write the engineering abl_a and abl_b back to the device in Qfil and reboot!That will give you access to fastboot mode.
    View
    1
    Surgemanxx
    Surgemanxx
    xpedro said:
    won't this make me lose root access? lineageos instructions says the device needs to be rooted in order to install the rom.
    Click to expand...
    Click to collapse
    Good possibility!The procedure is write engineering abl_a and abl_b first.Unlock the bootloader via fast boot.Then do the root procedure as normal with the boot_a and boot_ b file writes.Reboot the device.You should still have fastboot and root in place.It's the same as the LG V60 procedure since the file system is practically the same.
    View
  • 83
    S
    Seasee606
    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 Phone - Drivers and Software Downloads | LG USA Support

    LG Mobile Phone - Drivers and Software...
    www.lg.com 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
    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://xdaforums.com/f/magisk.5903/
    Xda Thread: https://xdaforums.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.
    View
    8
    S
    SnappyCrunch
    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
    View
    6
    M
    mc_365
    Seasee606 said:
    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.
    Click to expand...
    Click to collapse


    mc_365 said:
    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?
    Click to expand...
    Click to collapse

    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.
    View
    5
    C
    cloud1250000
    It should since the abl used is from a g8x and it worked on my v50 sprint.. :)
    View
    4
    way2aware
    way2aware
    ldeveraux said:
    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.
    Click to expand...
    Click to collapse
    v50thinQ.jpg
    v50thinq2.jpg
    View

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