From AT&T Website:
Update summary
Effective September 29, 2015, AT&T released a software update for the LG G2 (D800). This update will be made available to customers to download via Firmware Over The Air (FOTA). Wi-Fi is required.
Software update includes
Device security improvements
What to expect after the update
Although there should be no impacts to settings or data, we recommend that you sync or backup your contacts and files to a PC or with AT&T apps.
How to update
Select Menu or pull down the notification shade.
Select All Settings > General.
Select About phone > Software update > Update Now.
If not connected to Wi-Fi, message reads A software update is available for your device that requires Wi-Fi connectivity for download process to begin. Connect to Wi-Fi network? (If already connected, skip and go to step 5)
A new software update from AT&T is available for your device. This software update will take several minutes and will not delete any personal data on your device. All services (including emergency calls) will be suspended during the install.
Tap Continue
Status Message The software has been successfully installed. Your device is now ready to use.
Tap OK.
How to verify the update
From the home screen, press the Menu key, and then tap All settings.
From the "General" tab, scroll to and tap About phone.
Tap Software information.
Your phone's software version information will be displayed.
Android Version: 5.0.2
Baseband version:M8974A-AAAANAZM-1.0.190128
Kernel version: 3.4.0
Build Number: LRX22G
The Software Version: D80030g
Update File size: 17.1MB
http://www.att.com/esupport/article.jsp?sid=KB423381&cv=820
Update summary
Effective September 29, 2015, AT&T released a software update for the LG G2 (D800). This update will be made available to customers to download via Firmware Over The Air (FOTA). Wi-Fi is required.
Software update includes
Device security improvements
What to expect after the update
Although there should be no impacts to settings or data, we recommend that you sync or backup your contacts and files to a PC or with AT&T apps.
How to update
Select Menu or pull down the notification shade.
Select All Settings > General.
Select About phone > Software update > Update Now.
If not connected to Wi-Fi, message reads A software update is available for your device that requires Wi-Fi connectivity for download process to begin. Connect to Wi-Fi network? (If already connected, skip and go to step 5)
A new software update from AT&T is available for your device. This software update will take several minutes and will not delete any personal data on your device. All services (including emergency calls) will be suspended during the install.
Tap Continue
Status Message The software has been successfully installed. Your device is now ready to use.
Tap OK.
How to verify the update
From the home screen, press the Menu key, and then tap All settings.
From the "General" tab, scroll to and tap About phone.
Tap Software information.
Your phone's software version information will be displayed.
Android Version: 5.0.2
Baseband version:M8974A-AAAANAZM-1.0.190128
Kernel version: 3.4.0
Build Number: LRX22G
The Software Version: D80030g
Update File size: 17.1MB
http://www.att.com/esupport/article.jsp?sid=KB423381&cv=820