The following information displays N910AUU2EPG7:
The beta version was released over the OI6 and took the At&T Note 4 to PF4 firmware. Some users also reported receiving a Beta AT&T update for the same. The update comes in the form of a new firmware build number N910AUU2EPG7 which is an upgrade to the previous N910AUCS2DOI7 which was Android 5.1.1 Lollipop based.
After a long wait, Samsung along with the US carrier have now finally released an update to the premium Note series device. Here is a new Android 6.0.1 Marshmallow firmware for the AT&T Galaxy Note 4.