Hello, loyal iphone user.
Thank you for visiting Apple Support Communities.
Here are the steps that I would recommend when receiving error 14.
Check USB connections
Related errors: 13, 14, 1600-1629, 1643-1650, 2000-2009, 4000, 4005, 4013, 4014, 4016, “invalid response,” and being prompted to restore again after a restore completes.
If there’s an issue with the USB port, cable, dock, or hub, or if the device becomes disconnected during restore, try troubleshooting the USB connection, then troubleshooting your security software.
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694
Cheers,
Jason H.