Failed to update FW 7.0.6 iphone 4S Unknowen error (36)

Hello there, easy6.

The following Knowledge Base article offers up information for troubleshooting your issue:

Resolve specific iTunes update and restore errors

http://support.apple.com/kb/ts3694

Particularly:

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.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.