Trouble restoring iPhone 4

[tlr]

Long story short, my iPhone 4 was stolen a week after I got it last June, and miraculously the police found it and returned it to me this week.

When I turn it on it goes into recovery mode. I of course tried to restore using iTunes (10.2.2-12) and the latest iOS firmware. No luck. I initially got error code 2001, then 2006. In recovery mode I always get one of those two erros.

Next I tried putting it on DFU mode and doing the restore. Same thing but with error code 1611. In DFU mode I always get error 1611.

Any suggestions on what to try? I have no idea what the thief did to the phone. It was an AT&T phone stolen in Europe, so I suspect they tried to jailbreak/unlock it and failed.

Is it possible it's totally bricked, or are there more advanced ways to restore it?

 

[JediMeister]

There's some information about these specific error codes on this support article. Errors 2001 and 2006 suggest USB connection issues, but 1611 is labeled as a hardware fault. You are under the 1 year limited warranty, so unless you think the thieves took it apart or did something else to void the warranty you should be alright to exchange it through Apple.