It appears that some Mac and Windows PC users are unable to update their iPhone 18 Pro or iPhone 18 Pro Max devices with their computers. They receive the following error message when they attempt to update their devices using their computers:
“The iPhone Could not be Updated. An Unknown Error Occurred (4000)”
You can update your device manually by connecting it to your computer if you can’t, or don’t want to, update wirelessly on your iPhone 18 Pro. Open the Finder on your Mac, or open the Apple Devices app on your PC. If your PC doesn’t have the Apple Devices app, or your Mac is using macOS Mojave or earlier, open iTunes instead.
Error 4000 is not documented by Apple. It appears that a connection loss between your device and iTunes during a sync or update process causes this problem. It further appears that this issue affects Mac and PC users alike.
Are you having this issue and seeing the above “Update Error 4000” message on your computer? Then this article is for you. In this article, we explain how you can fix this iTunes problem. Try the following steps:
Please note that after trying each step below, test iTunes again to see if you can update.
Please note that you can always try to update your device wirelessly by going to Settings > General > Software Update.
1. Basic steps
Please first try the following tips:
- Use a different USB cable.
- From your computer, unplug all USB accessories, test each USB port on your computer to see if one of them works.
- Try connecting your device to another computer, if you have another computer.
- Restart your computer and your iPhone.
- Press and hold either volume button and the side button until the power-off slider appears.
- Drag the slider, then wait 30 seconds for your device to turn off.
- To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
- Your antivirus and/or firewall software may cause this problem. Temporarily disable them and test.
2. Update your computer and iTunes
Make sure that you’ve installed the latest software updates. To install updates for macOS, go to Apple menu > App Store, then click Updates in the App Store toolbar (this is if you are using macOS High Sierra, Sierra, El Capitan, or earlier). Then follow the onscreen instructions. Use Spotlight in the menu bar to search for “Software Update,” then click to open it from the search results. Or choose System Settings from the Apple menu in the corner of your screen. In the window that opens, click General in the sidebar, then click Software Update on the right. On your Mac, try and see if you can update your Mac to macOS Catalina or later, then you can use Finder to update your device. Please note that your computer may not be compatible with newer macOS versions, especially if you have an older computer.
Furthermore, ensure that you have the latest version of iTunes on your computer, PC, or Mac. On your Mac, if you cannot update your Mac to macOS Catalina or later, open App Store, click Updates and see if there are iTunes updates.
On your PC, how you update iTunes depends on where you downloaded iTunes from:
- If you installed iTunes from the Microsoft Store: Open Microsoft Store then go to More > Downloads and updates > Get updates.
- If you installed iTunes from Apple’s website: Open iTunes and click Help > Check for Updates.
And lastly, ensure that your PC is up to date.
3. Remove passcode
Some users have reported that turning off the passcode fixed their problem. You can try this too. First, turn off your passcode and you can try iTunes and then set a passcode on your iPhone 18 Pro again. Here is how:
- Turn off the passcode: Tap Settings > Face ID & Passcode > Enter your passcode and select Turn Passcode Off.
- Now try to update your device again. Is it working?
- Now if you want, you can set a new passcode by going to Settings > Face ID & Passcode.
4. Force restart your device
Force restart your device and try again. Disconnect your device from the computer and then:
- Press and quickly release the volume up button.
- Press and quickly release the volume down button.
- Press and hold the side button until you see the Apple logo (this might take longer than 10 seconds).
If you continue to see this error message, you can try using recovery mode or contacting Apple for further support.
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