Things don't always go smoothly - and so at the weekend I got hold of an older iPad Pro that didn't want to update to iPadOS 15.0.2 - but the error also occurred during the planned update to iPadOS 15.0.1.
While the update on iPadOS 15 worked flawlessly at the time, the new update did not work. I don't know what ended up being choked up and why. What is certain is that the iPad reported that it could not be updated - error 4000.
Now there are several ways that lead to Rome - without having to flatten the entire iPad or iPhone and restore it from an (iCloud) backup. The first way led me to the storage settings> Apps in order to delete the downloaded update from the storage. Another download produced an identical error.
The second way was wired to the computer, but the update via iTunes also failed. Browsing Apple's support forums actually helped, they had a strange, undocumented piece of advice that actually helped. Maybe something to keep in mind. For example, the iPad's lock code had to be removed at short notice for a functioning update (under "Settings"> "Touch ID & Code") - then the update to iPadOS 15.0.2 ran correctly - and after the update, the iPad reminded me but to use a code again.
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