Hi BenS1414,
Thanks for using Apple Support Communities. This article has steps you can try for issues restoring your iPhone including error 11:
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694
Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.
Cheers,
- Ari