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Level 1

4 points

iOS Update error 4000

Not able to update my iPhone Pro Max into iOS 15.4.1. An unknown error occurred 4000. Any idea??

Posted on Apr 22, 2022 6:35 AM

Top-ranking reply

Level 10

209,061 points

Posted on Apr 22, 2022 10:02 AM

See this Apple article: If you see an error when you update or restore your iPhone, iPad, or iPod

Guess you use a Windows PC, if so check the AV & Firewall you use on the PC.

Disable all AV & Firewalls temporarily while you restore & update your apple device.

If they are On, turn Off Hotspot & VPN.

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