If you’ve encountered the message, “The iPhone could not be restored. An unknown error occurred. 06B4.0000,” on your iPhone 18 Pro or iPhone 18 Pro Max, you’re not alone. Users report that this error appears during the update or restoration of an iPhone using a Windows PC. In some cases, the process gets stuck partway through, leaving your device displaying the Apple logo with a partially loaded progress bar.
Apple’s troubleshooting for update and restore errors covers outdated computer software, USB connections, third-party security software, and your computer’s connection to Apple’s software update servers.
In this guide, I’ll walk you through fixes for this error to help you successfully update or restore your device.
Fix 1: Check Your USB Connection
Use the USB cable that came with your device. If you don’t have it, use another Apple-certified USB cable.
- Switch to a different USB port on your computer. Don’t use the USB port on your keyboard, as keyboards often lack sufficient power for updating or restoring devices.
- Switch to a USB port on a different computer.
Fix 2: Update the Apple Devices App to the Latest Version
Make sure that you have the latest version of the Apple Devices app on your Windows PC. After you download the Apple Devices app, you can check for updates in the Microsoft Store.
Steps to Update the Apple Devices App:
- Open the Microsoft Store on your Windows PC.
- Search for Apple Devices in the store’s search bar.
- Check if an update is available. If it is, click Update to install the latest version.
- Once the update is complete, restart your computer and try restoring or updating your device again.
Fix 3: Use iTunes Instead of the Apple Devices App
If updating the Apple Devices app doesn’t resolve Error 06B4.0000, try using iTunes to update or restore your iPhone.
Steps to Use iTunes:
- Go to the Microsoft Store: Download iTunes for Windows.
- Download and install the latest version of iTunes on your Windows PC.
- Open iTunes and connect your iPhone to your computer using the USB cable that came with your device.
- Select your device in iTunes, and follow the prompts to update or restore your device.
Fix 4: Disable VPN and Try Again
If you’re using a VPN or other security software on your Windows PC, check that it isn’t blocking connections, and check that your computer can connect to Apple’s software update servers.
Steps to Disable VPN:
- On Windows PC:
- Open your VPN application and turn it off.
- On iPhone:
- Go to Settings > General > VPN & Device Management > VPN and toggle off the VPN connection.
- Once the VPN is disabled, retry the update or restore process using the Apple Devices app or iTunes.
Try these fixes, then update or restore your iPhone again. Let me know in the comments below which solution worked for you or if you encountered any additional challenges!
