Trying to update iPad keep getting -1 error

i have a mac os x 9.5.10, i am trying to update my nephews mini iPad an unknown error occurred  (-1)
now it is telling me i have to reinstall and will lose everything.
please help

Greetings sansun911,
After reviewing your post, I have located an article that can help with Update and Restore errors. It contains a number of troubleshooting steps and helpful advice for the issue you are experiencing. Has the device been backed up via iCloud or a computer at any point?
Resolve iOS update and restore errors - Apple Support
Check for hardware issues
Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
These errors mean that your device or computer may have a hardware issue that's preventing the update or restore from completing.
Check that your security software and settings aren't preventing your device from communicating with the Apple update server.
Then try to restore your iOS device two more times while connected with a cable, computer, and network you know are good.
Confirm that your security software and settings are allowing communication between your device and update servers.
If you still see the error message when you update or restore, contact Apple support.
Thank you for contributing to Apple Support Communities.
Take care,
BobbyD

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