Out of the blue and without any fanfare, Google rolled out Android 4.3.1 for LTE Nexus 7 2013. It is an incremental update, but Google hasn't described at length exactly what changes this update, Android 4.3.1, (JLS36I) brings. As of now, the update has only been rolled out for the LTE Nexus 7 2013, and not for any other Nexus device. Since no new major features have been added, the update weighs in at just 9.42MB and is available for download right now on the compatible tablet, over the air.
The changelog of Android 4.3.1 indicates that the update brings performance and stability improvements for the Nexus 7 tablet.
Ubergizmo , Android 4.3.1 For LTE Nexus 7 2013 Released, Android 4.3.1 For LTE Nexus 7 2013 Released