Use this utility to check if you have a valid unlock.bin for your LG G6 (may also work for LG G5). After compiling, run it in with your terminal: java -jar lg-bf.jar Imei: 356144087429995 DeviceId ...
If you want to make deep and lasting changes to your device, you need to unlock the bootloader. Not all phones can be unlocked, but you can add the LG G5 to the list of those that can. Well, the ...