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unknown error 4000 during ios update

iTunes says to connect my iPhone 6 to update its software.


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It asks for the four digit code. I do that and it downloads and extracts software.


Then I get a message that says

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On the iPhone 6 settings it says my version is 9.2.1 (13D15).


Can someone tel me what's going on?


Jim

Posted on Mar 1, 2016 8:43 AM

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Question marked as Top-ranking reply

Posted on Mar 1, 2016 11:30 AM

That is because your phone is already updated to iOS 9.2.1. Just ignore the message. Sounds like itunes is out of sync. I got this same message this morning when I connected my phone to the computer but I just canceled it since I knew my phone was already up to date.

3 replies

unknown error 4000 during ios update

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