AT&T is now rolling out a December security patch update for LG V20 smartphone users. The software update is already in live and begins to hitting many devices. LG V20 users have also posted the before and after update notification screenshots in forums. The firmware arrives with new build number (NRD90M) and software version (H91010L).
After completed the installation your device android security patch level will be updated to December 1, 2016. The android version stays in 7.0 only and will not be updated to 7.1.1 version. The latest software will not erase any of your personal data from your phone. The carrier is pushing this update through OTA, so connect your device to wifi or mobile data to receive this update. For manual update checking go to Settings > General > About phone > Update Center.