LG G4 811 (T-Mobile): Unlock bootloader, install TWRP and root with SuperSU

19. March 2017 - Computer Science

This second article of my mini series will step you and your LG G4 811 trough unlocking the bootloader, install the custom recovery TWRP and get root access with SuperSu.

Let’s start with the important part: It is your phone, you are responsible for everything you do with it. Don’t blame me if you make it worst trying to follow any of my articles. You do everything at your own risk. All data will be lost. Don’t forget to take a backup if you need anything.

Make sure that you read LG G4 811 (T-Mobile): Unbrick or factory reset with stock ROM and have everything prepared in case something goes wrong.

This article bases on some other guide, namely this and that. I adapted some details so it worked for me.

Preparation

  • enable developer mode
    • open Menu > Settings > About phone on your LG G4
    • tap 7 times on the Build number, it will day “You are a developer now”
    • enter the new submenu in Settings names Developer Options
    • enable Enable OEM Unlock
    • enable USB debugging
    • reboot your device if it didn’t so itself
  • install the USB driver for LG phones on your PC with the latest installer you get from http://lgusbdriver.com.
  • download and extract Fastboot and ADB
  • download TWRP Recovery (tested with 2.8.7.2-h811.img) and copy it next to fastboot.
  • download SuperSU (v1.94 didn’t work for me, v2.46 soft-bricked my LG G4, so I finally used latest 2.79)

Unlock bootloader

  • connect your device to you PC
  • open a command window in your fastboot directory
  • adb devices should now list your device
  • reboot to bootloader with adb reboot bootloader
  • unlock the bootloader with fastboot oem unlock
  • you can check it with fastboot getvar unlock or just fastboot reboot and see the hint that your device is unlocked in the top left corner while starting

Flash TWRP

  • connect your device to you PC
  • open a command window in your fastboot directory
  • adb devices should now list your device
  • reboot to bootloader with adb reboot bootloader
  • flash twrp with fastboot flash recovery twrpXXXX.img
    • you will see something like:
      target reported max download size of 536870912 bytes
      sending 'recovery' (32968 KB)...
      OKAY [ 1.088s]
      writing 'recovery'...
      FAILED (remote: unknown command)
      finished. total time:'
    • ignore the last warning
  • reboot with fastboot reboot

Flash SuperSu

  • copy SuperSuXXX.zip to your phone
  • reboot to recovery
    • unplug your phone and shut it down, hold VOLUME DOWN and POWER buttons to boot into recovery
    • if this doesn’t work, as with my device, connect your phone to the PC and call fastboot boot twrpXXXX.img
  • tap on install
  • select the SuperSUXXX.zip
  • reboot after installation
  • check the SuperSU app after reboot

 

Comments

  1. lado sagt:

    Hi
    on my phone (LG G4 H811 T-Mobile) 7 times click on the Build number nothing happens ((
    ROM: H81120o_00_0613.kdz

    • mnhg sagt:

      There is also a counter for every tap displayed: “5 to go…”, “4 to go” etc., If you also don’t see this, you are maybe already in dev mode?

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