I suggest this article iTunes: Specific update-and-restore error messages and advanced troubleshooting found here http://support.apple.com/kb/ts3694#error1014
Error 1002, 1011, 1012, 1014 : These errors may indicate a hardware issue with your device. Follow the steps in this article. Also attempt to restore while connected with a known-good 30-pin Dock Connector cable, computer, and network to isolate this issue to the device. The MAC address being missing or the IMEI being the default value (00 499901 064000 0) can also confirm a hardware issue.