Hey guys im currently running into some issues with my iPhone 4 refusing to connect to AT&T so i cant receive calls, texts, or emails. Because of this issue i need to restore my phone but iTunes keeps stopping the process saying my phone isn't eligible for the requested build. I have tried restoring out of DFU mode several times, ive tried changing the cydia settings on tinyumbrella and ive tried restoring to the OS im currently running (5.1) and all have failed. any help I can get is greatly appreciated.