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Level 1

4 points

unable to back up iphone with error message 400

back up iphone failed with error message as abvove

Posted on Jun 2, 2021 6:49 PM

Top-ranking reply

Level 10

418,879 points

Posted on Jun 2, 2021 8:50 PM

Do you mean 4000?

If you see Error 4000 updating your iPhone with Windows iTunes - Apple Community user document. Click here to read --> https://discussions.apple.com/docs/DOC-250003773

See these 5 pages of discussion about iOS14 Error 4000 --> https://discussions.apple.com/thread/251804526

Another solution by manually selecting the update file in WIndows:

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