AT&T S7 is on "PB5" firmware yet no updates found

[zzoinks]

My wife's S7 is still on "PB5" with the Feb 1, 2016 security patch level. I have tried both over the air (including setting date ahead manually and re-checking) and via Smart Switch but no updates are found. I know the phone is very out of date. What gives?

Is there something I can reset to force and update? We bought the phone brand new on release day so I'm pretty sure it's not blacklisted.

Thanks,
-Brett.

 

[zzoinks]

So... that's a negative? No suggestions?

Thanks,
-Brett.