Update problem iPad Pro
Trying to update to iOS 15.0.2 and then 15.1 I have an error 4000
Tried everything except downgrading iTunes ,is it the best solution?
iPad Pro 12.9-inch Wi-Fi
Question marked as
Top-ranking reply
Sounds like you may be trying to update with a Windows 10 computer and iTunes. See this for some help.
Error 4000 is a Windows 10 and iTunes error. Until Apple updates iTunes, you will continue to receive the error if you attempt to update or restore your device in iTunes. A workaround for now is to temporarily disable the passcode on your device, update, then put the passcode back on. The con to this is that it will remove all of your credit cards in Apple Wallet. Another option is to go to Settings>General>Software Update and update from there.
I understand that an update had been done to iTunes to fix the error, however that latest update of iTunes has brought it back. You can provide feedback to Apple here.