This is not working on my 5th generation pro model. Says cannot be restored unknown error!
Restore process does not work. Says unknown error. help!
iPad Pro, iPadOS 15
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See >>> If you can't update or restore your iPhone or iPod touch - Apple Support
If you continue to experience difficulties you may need to seek assistance directly from from Apple Support. You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, if you have access to another device, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:
https://apps.apple.com/gb/app/apple-support/id1130498044
You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad: