Preparation:
Make sure your phone battery is charged to 70% or more
Make sure you install the LG USB Driver on your PC, if you haven’t already.
Backup your device data
Enable USB Debugging, by open Settings > Developers Option > USB Debugging
If Developers Option is hidden, go to Settings->About Phone->Software Info > build number (tap on it for 5-8 times)
build number ကို ၅ ခ်က္မွ ၈ ခ်က္ထိ နွိပ္ေပးပါ..