In this tutorial we will show you:
How to unlock LG Optimus G Pro E980 Steps:
If you don’t have a sim card from another carrier, try this way:
LG Optimus G Pro E980 Wallpapers – LG Cell Phone Pictures

The purpose of this article is to teach you to get root access on your LG Optimus G Pro. This guide is intended for use by Windows users with an AT&T LG Optimus G Pro (AKA LGE980). Be careful, good luck, and have fun!
How to root AT&T LG Optimus G Pro E980 Steps:
LG Optimus G Pro E980 USB Drivers Download:
LG Optimus G Pro User Manual / Guide:
Official AT&T LG Optimus G Pro Firmware / Rom / Flash File
How to Flash AT&T LG Optimus G Pro E980:
Stock LG Optimus G Pro wallpapers Download:
LG Optimus G Pro E980 Wallpapers – LG Cell Phone Pictures

Following it the corrected instructions on how to return/unbrick/downgrade your LG Optimus 4X HD P880 back to stock. I have confirmed this works. I have performed these exact steps on my own LG Optimus 4X HD P880.
Warning: This instructions will brick your phone, no one should try this without any preparation. I will not responsible for any damage. The method did work for me, I have tested this on my won LG Optimus 4X HD P880, but did not know whether this is works on your phone.
LG FlashTool and Accessories:
LG Optimus 4X HD Phone Photos – LG Cell Phone Pictures
Video tutorial: http://www.youtube.com/watch?v=NDyZ8pH2jp0
LG Optimus 4X HD Phone Photos – LG Cell Phone Pictures
