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Level 1

4 points

could not be updated.an unknown error occurred (4000) what is this problem

for new update for my iphone error with itunes from my windows compuer

Windows, Windows 10

Posted on Mar 9, 2021 10:36 AM

Top-ranking reply

Level 10

274,552 points

Posted on Mar 9, 2021 10:42 AM

See If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support. If you're trying to update using iTunes try over the air instead, or vice versa.

Note if you're getting a -4000 error when updating from iTunes you need to disable Find My iPhone, update, then enable again afterwards.

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