Make sure that you’ve installed the latest software updates. Your antivirus and/or firewall software may cause this problem.Restart your computer and your iPhone or iPad.Try connecting your device to another computer, if you have another computer.From your computer, unplug all USB accessories, test each USB port on your computer to see if one of them works.See this article if iTunes does not see your device. See this article if the wireless update fails. Please note that you can always try to update your device wirelessly by going to Settings > General > Software Update.
Please note that after trying each step below, test iTunes again to see if you can update. In this article, we explain how you can fix this iTunes problem. See also: iTunes Error 9006: An Unknown Error OccurredĪre you having this issue and seeing the above “Update Error 4000” message on your computer? Then this article is for you. It further appears that this issue affects Mac and PC users alike. It appears that a connection loss between your device and iTunes during a sync or update process causes this problem. If you are using a Mac with macOS Mojave 10.14 or earlier, or a PC, you will need to use iTunes to update if you can’t, or don’t want to, update wirelessly on your iOS or iPadOS device.Įrror 4000 is not documented by Apple. You can update your device manually using iTunes by connecting it to your computer.
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