LG Optimus G Pro for AT&T receives Kit Kat update9
The update includes an improvement to the battery life, restyled status and navigation bars, a new full-screen mode, support for the Google Cloud printer and enhanced processing speed. You can try to pull the update out of your phone by going from Settings > General Tab > scroll to About Phone > Software update > Update now.
The new software version is E98020g, and considering that the update will be 700 to 800MB in size, we would suggest that you be on a Wi-Fi connection when downloading and installing it. Also, make sure that your battery is at least 50% charged.
source: AT&T via AndroidPolice