1. Check that your security software and settings aren't blocking your device from communicating with the Apple update server.
2. Try to restore your iPhone, iPad, or iPod two more times while connected with a cable, computer, and network you know are good.
3. Make sure that your security software and settings are allowing communication between your iPhone, iPad, or iPod touch and update servers.
4. If you still see the error message when you update or restore, contact Apple support.
If you still see the error message, check for outdated or modified software.