Go to your AT&T store and ask where the nearest Device Support Center is. (It could be in the back of that store, or in a nearby one.) They should be able to get data off the phone - assuming that there's any left on it. (When you say "loopback", do you mean "bootloop"? That could mean that your data is gone, along with Android itself. [Loopback means that if you go to your IP address using your PC, the router will recognize that you're trying to connect to a device on your LAN, and it won't go out to the internet looking for the address - it "loops back" into the LAN.])
If Android is gone, the DSC can reflash it, but you get the stock Android - if you didn't back up your data, it's lost. (If you entered your contacts as Google contacts, the names, numbers, addresses, etc. - but not the pictures - are at
Google Contacts, and once the phone is fixed, it will sync them back.)