Q: can someone please help, unable to update or restore due to error code -1

That is usually a hardware error and you will need to get it serviced. You can also get the same message if the iPhone has previously been jailbroken.

Try the steps from this article. Get help with iOS update and restore errors - Apple Support

Check for hardware issues

If you see error 53, learn what to do.

Errors: 1, 3, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 56, 1002, 1004, 1011, 1012, 1014, 1667, and 1669.

Your iPhone, iPad, or iPod touch or computer might have a hardware issue that stops the update or restore from completing.

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If you still see the error message, check for outdated or modified software.

-AJ