Error code 4000
Hello, was trying to update my iphone 12 and I got the error message code 4000?? Could not find an answer? Can somebody help me?
iPhone 12
Question marked as
Error 4000 is an undocumented error code (at least publicly undocumented). It means that the connection between the phone and iTunes was interrupted in the middle of a sync or update activity. In the past this might have been caused by a flakey USB port, an antivirus or a firewall. However, there is a new cause of this error that is the result of a bug in iTunes for Windows that requires the phone not be locked during the update. I think this has been finally fixed in the latest iTunes update, so try getting that from the Microsoft Store. If not first check your antivirus and firewall (temporarily disable them), but if that doesn’t fix it there are three workarounds for the bug:
- Update over the air, by going to Settings/General/Software Update
- Temporarily disable the screen lock passcode on the phone before updating using iTunes on Windows
UPDATE from chcn, who worked out a different workaround:
This afternoon I successfully tested a workaround to this defect. Use recovery mode, but ensure to select Update and not Restore.
Doing this I was able to update both an iPad Pro and an iPhone 13 Pro over the wire from iOS 15.3.1 to iOS 15.4, using iTunes 12.12.3.5 on Windows 10. I did not have to remove passcodes and no stored cards, etc. were lost.
- Make sure you have iOS or iPad OS 15.4 downloaded. If you previously tried an update using iTunes, this should have already occurred.
- Put your device into recovery mode using the instructions here or here.
- When iTunes prompts to Update or Restore, click Update:
- Be patient. This will be a bit scary because there will be a point where it just sits for a long time with the Apple logo and nothing else on the screen. Don't attempt to reset it or anything. At some point it advance to this:
- Be patient some more. It should eventually prompt you to press the home button or swipe up, and you'll find everything is still there, but with iOS 15.4 installed.
Your mileage may vary, and normally recovery mode should be reserved as a last resort. For most people an over-the-air update is probably a better choice until they fix this bug, but I like installing the complete package instead of the deltas that are in the OTA packages, and I'm not afraid to experiment a bit.
In the meantime, I encourage everyone to report this defect using Apple's feedback and support tools.