[LG G7 ThinQ  Guides, News, & Discussion] netookska05:
This May Work With Other Devices As Well.

Prerequisites:

Starting from Bootloader Locked Stock Verizon.

CrossFlash to G710ULM11g.kdz: LG G710U | LG G7 ThinQ | Version: G710ULM11g_01_NAO_US_OP_1112 | Firmware for Region: BPT from UNITED STATES - Lg-firmwares.com (lg-firmwares.com)

Fastboot works on the G710ULM11g.kdz no need to erase laf.imgs.

See the 2 links below for crossflashing threads.

(There are 2 ways to crossflash).

1. Use LGUP, Partition DL and Refurbish is you want the kdz on both a and b slots: https://mega.nz/#!kCpHBaia!xZmico6MYL1T07ffuc8z6cCbs5oU4pKEz5VG-AwfvV0

2. Power Shell Command line Crossflashing thread: https://xdaforums.com/lg-g7-thinq/how-to/cross-flash-oreo-pie-firmwares-lg-g7-g7-t3915303

Files required to unlock bootloader while crossflashed to the ULM11g.kdz V35eng file and firehose file for Qfil. https://xdaforums.com/lg-v40/development/unlock-lg-v40-via-9008-root-t-mobile-t4042207

Zip contains Stock G710VM21b stock boot_a and boot_b img and Magisk patched boot_a and boot_b imgs. https://www.androidfilehost.com/?w=files&flid=322268

Latest Verizon kdz LG G710VM | LG G7 ThinQ | Version: G710VM21b_04_0812 | Firmware for Region: VRZ from UNITED STATES - Lg-firmwares.com (lg-firmwares.com)

NOTE: Some links are from other helpful threads so thank whoever wrote them.

To successfully unlock the bootloader while on the crossflashed 11g,

Setup Device then go into Developer options and Enable the OEM Unlock toggle and enable usb debugging in the phone.

Now Let's Begin:

1. Switching the phone to EDL mode:(open device manager):

Turn off the phone, then hold the vol- and power buttons together and repeatedly press the vol+ button until you see device in device manager as "Qualcomm HS-USB QDLoader 9008". then release buttons. If you don't succeed at first keep trying.

2. Using QFIL:

3. Load v35eng.img to abl_a partition:

in the upper left menu, select Tools, then partition manager , look for abl_a in the window that opens , Right click abl_a, select manage partition data, then use the V35eng.img overwrite the abl_a with load image.

4. Reboot into Fastboot to Unlock the bootloader:

Leave EDL mode by holding the volume down and power for about 10 seconds. Phone will restart. Turn off phone disconnect usb and hold vol- and plug in usb. (phone should boot into fastboot like the picture).

Now we need platform tools unpacked to any folder convenient for you, launch the shell by pressing the shift + right mouse button and choosing to open the power shell window here .

Use the command : "fastboot oem unlock" without quotes

Use the command: "fastboot reboot" without quotes

That's Everything the bootloader is unlocked.

Crossflash back to Stock G710VM21b.kdz and root or crossflash to android 10 kdz to install custom roms.

To Root stock 21b use EDL mode for Qfil to load the magisk patched 21b boot.imgs to boot_a and boot_b reboot and install magisk.apk then it should update to latest magisk zip.

***NOTE***

​

Only use this part of the guide if you are relocking bootloader. This locking bootloader procedure may work for other devices use at your own risk.

***Do not uninstall magisk with the magisk uninstall button. Just go into download mode and crossflash to ULM11g. If you use the uninstall button in magisk manager you will brick your device.**

To relock bootloader:

Cross Flash back to ULM11G, setup phone, enable Developer options, enable USB debugging. (Enable OEM unlock) should be greyed out don't worry).

Platform-tools and issue powershell commands:

1. PS C:\Program Files\platform-tools> adb devices

List of devices attached

LMG710ULM******** device

2. PS C:\Program Files\platform-tools> adb reboot bootloader

3. PS C:\Program Files\platform-tools> fastboot oem lock

(bootloader) Erasing userdata and cache OKAY [ 0.492s]

Finished. Total time: 0.592s

4. PS C:\Program Files\platform-tools> fastboot reboot

Rebooting OKAY [ 0.000s]

Finished. Total time: 0.004s

To confirm locked bootloader:

Enable developer options again and you will see (Enable OEM Unlock) Unchecked.

***Profit Bootloader is locked***[/QUOTE]