Generally speaking, there could be 3 possible reasons causing iOS updating failure: Why iPhone saying error 4000 when updating? An Unknown Error Occurred (4000), just follow this passage to know why it happens and how to solve it. If you see the error message that The iPhone Could not be Updated. The process might fail even if you have downloaded the installation package in iTunes. Updating an iPhone is necessary because new iOS like iOS 14.5 give users more features. How can I solve the problem and update my iPhone now?Īpple usually pushes update for iPhone users to introduce new features and fix the bugs in the present iOS.
I clicked Update but after a while, it reported: can't update iPhone error 4000. I connected iPhone 12 to iTunes and there was an available iOS 14.5 update that had been downloaded.