You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

💡 Did you know?

⏺ If you can't accept iCloud Terms and Conditions... Learn more >

⏺ If you don't see your iCloud notes in the Notes app... Learn more >

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Level 1

4 points

If see an error when update Iphone. An unknown error occurred (4000)

i already several time to update my Iphone but an unknown error occurred (4000).

i update using itunes at my notebook window 10

iPhone 12 Pro

Posted on Sep 6, 2021 1:21 PM

Top-ranking reply

Level 10

91,293 points

Posted on Sep 6, 2021 3:04 PM

Make sure you are using the latest iTunes for windows.

If you still have problems, temporarily disable Passcode on the phone.

View in context

Similar questions