[LG G7 ThinQ  Guides, News, & Discussion] sandronejm:
mine was already bootloader unlocked,

but tutorial worked fine here I flashed 20e using LG up and rooted.

What I did:

MAKE SURE YOU ARE BOOTLOADER UNLOCKED. I am not responsible for any damage, it is only what I did.

1)Dowload the 20e firmware: https://lg-firmwares.com/downloads-file/21135/G710ULM20e_00_NAO_US_OP_1010

2) Download this: LGUP new version - https://drive.google.com/file/d/1dJZxrj7nteDDUcQpiJLpX9Mjumm5mtKp/view

3) Install the file you downloaded above (LGUP).

4) Download this: LGUP common.dll https://drive.google.com/file/d/1V8IF2vJed3bQBsBCHLNBJdnW4gRj2uo0/view

5) Open the file downloaded and you will see the folder common. Copy the folder common and paste inside the folder model of the folder of the installation of the LGUP. For example: C:\Program Files (x86)\LG Electronics\LGUP\model

6) You are doing great! Congratulations. Let's proceed with 7.

7) Get phone in hands. Turn off it. Press and hold volume up and connect the phone into notebook. once appears download mode panel you unhold volume up softly.

7.1) When you connect the phone in download mode LG device must show in Windows Device Manager under "Ports" as a LG Serial COM port. Check it.

8) check if you completed the download of the kdz file. Did you complete the download of the big KDZ? Put the KDZ file in C:\ localization of your computer.

9) Let's open a command prompt as administrator. Now, in the command prompt input, type:

cd <path of LGUP folder>

Example:

cd C:\Program Files (x86)\LG Electronics\LGUP

10) Is your phone com5? check in Device Manager under Ports. It is written COM and a number after. If the answer is yes, you only have to type this code and run in the command prompt:

lgup_cmd.exe com5 "C:\Program Files (x86)\LG Electronics\LGUP\model\common\LGUP_Common.dll" "C:\G710ULM20e_00_NAO_US_OP_1010.kdz"

11) Are you unsure if your phone is com5? just modify com5 to comX replacing X with the properly number. For my EMW worked with com5.

lgup_cmd.exe comX "C:\Program Files (x86)\LG Electronics\LGUP\model\common\LGUP_Common.dll" "C:\G710ULM20e_00_NAO_US_OP_1010.kdz"

12) Wait 5 minutes, less or more.

13) it is completed! Remove the plug of the device.

14) It is like a new phone you have to conclude the phone configuration.

15) install magisk from magisk website but dont update it.

16) Get developer options enabled in your phone.

17) Open command prompt as administrator, type this code:

cd <path of minimal adb and fastboot folder>

Example

cd C:\Android-FastBoot-Adb

Don't have adb and fastboot minimal folder? Research in google and download. If you don't know what is the folder, it contains fastboot.exe inside.

18) Type this code now: adb reboot bootloader

19) confirm in phone allow usb depuration in this device or the command wont work

20) Download in your windows this pre rooted file made for this PIE OS by the author of the thread

https://mega.nz/#!uqZFDKZQ!5dOCFKElmMOXnAMel7dSvyhGY5RkJjBsMwM-kH7eOGo

21) put the file inside the fastboot folder. the file name is g7_20ulm_20e_boot_magisk_patched.img

22) in command prompt (already in cd path of minimal fastboot folder) type this:

fastboot boot g7_20ulm_20e_boot_magisk_patched.img

23) phone will reboot.

24) now phone started, open magisk and update it and click to install directly when it asks.

25) magisk will ask to reboot, click to reboot you are now rooted.

good luck