AT&T is rolling out the July 1 security patch to the . The update comes in at 22.6MB, and increments the build number to MMB29K.N920AUCS2BPG1 and the firmware version to N920AUCS2BPG1. The mention that the build was compiled on July 4, and the patch itself contains fixes from the and not those from July 5 (which will likely be rolled into the August update).
On the AT&T Note 5? Head into Settings > System > About device > Software update > Check for updates to initiate the download.
On the AT&T Note 5? Head into Settings > System > About device > Software update > Check for updates to initiate the download.