Well, at this point, I have done a factory reset several times. No root, nothing installed.
Knox keeps giving me a notification that it's blocking a process... I can download the update and start the install process. Once the phone reboots and the AT&T splash screen comes up, the progress bar will start and get to about 20%, then the phone will restart, then boot normally. Once booted, it will go to the Update page and then say that the installation was interrupted.
What... the... heck... I thought a factory reset restored the phone to like how it was from the factory? I notice my keyboard is the old version, too. When I bought the phone, I had the updated keyboard with punctuation for long-key presses.