DOWNLOAD ALL THE REQUIRED FILES!
1. Make sure the battery of your device is above 80% or fully charge.
2. Download LG G2 PC driver "so that the computer can detect your device".
3. Download LG Flash Tool .
4. Download the latest stock rom at http://lg-firmware-rom.com/ and just enter the IMEI.
5. Turn OFF your phone and plug the usb cable to your PC " do not plug the usb cable to your phone yet".
6. Enter Download mode.
- Press Vol Up button.
- Plug the usb cable to your phone.
7. Open LG Flash Tool and Run as Administrator and locate the ROM that you've downloaded in step 4.
8. Then choose CSE Flash "To fully wipe and back to stock lg g2" Normal Flash " If you want to fix some buggs or system error" . just use the CSE Flash its recommended.
9. And Press START.
10. WATCH YOUR DEVICE AND WAIT IT TO FINISH 100% AND WAIT IT TO REBOOT. IF YOU SEE THE IMAGE LIKE BELOW. JUST IGNORE IT.
11. FINISH :)