AT & T has not announced the V10u software date yet. When the update is available, A FOTA (firmware over the air) notification of the software update will be sent to your phone.
How to update your LG G2
Connect to a Wi-Fi network.
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 update.
Tap Update now.
A notification will be displayed. Tap Continue.
Once your update is completed, a notification screen will be displayed. Tap OK.
At this time, we did not know the change log for the V20u software Update.