In my case, the problem was explained to me by ATT.
I have the 4.7 DM version installed on my pc. They only support up to 4.6.
Next, they said the device's software version should only go to 4.5.
Yes, the numbering/naming system is confusing.
So, I will remote 4.7, downgrade to 4.6. Then check device: Settings > Options > About > 3rd row of #'s, verify not higher than 4.5. Anything lower than 4.5 must be upgraded.
All software available from the att kom slash bbdownloads in my case...