A bootloader is usually locked on an Android device because although it’s an open source OS, still the manufacturers want you to stick to their Android OS version specifically designed for the device.
In order to apply this concept, manufacturers lock the bootloader.
With a locked bootloader on Android devices, it is virtually impossible to flash a Custom ROM and forced attempts void warranty as well.
Therefore, the first step is to always unlock the bootloader.
Note – Unlocking the bootloader of the LG G6 will wipe all of the user data off of your device.
This is how it is on other devices and it remains the same for the LG G6.
So be sure to backup as much of your information as possible before you proceed with this tutorial.
1. Enable Developer Mode on the LG G6
2. Enable OEM Unlocking on the LG G6
3. Boot the LG G6 into fastboot mode
4. Type the following command into the Command Prompt "Fastboot oem unlock" and press Enter on the keyboard.
5. Wait for the Command Prompt to tell you the process has finished
8. Then type the following command into the Command Prompt "fastboot reboot" and press Enter on the keyboard to boot the LG G6 back into Android.
Since this whole process wipes your user data, you’ll be taken to the Android activation screen and asked to enter your Google account back into the device.
You’ll then need to setup all of your applications and games and settings again unless you have a backup that you can restore from.