iOS: Troubleshooting update and restore issues
Follow these steps if you receive an error or alert message when attempting to update or restore your iPhone, iPad, or iPod touch using iTunes.
Using these steps, you can resolve most restore errors on your iPhone, iPad, or iPod touch:
- Install the latest version of iTunes.
- Verify that your computer operating system is up to date. If an update requires a restart, check for updates again after restarting.
- On a Mac: In the Apple () menu, choose Software Update. Install all available updates.
- On a Windows PC: Go to the Microsoft Windows Update page.
- Check your security software: Note: Most restore issues are caused by out-of-date or incorrectly configured security software, firewalls, and network router settings or firmware.
- Isolate the issue to third-party software.
- Update security software.
- Properly configure your security software.
- Temporarily disable or uninstall your security software.
- Temporarily remove any unnecessary USB devices, leaving only your iPhone, iPad, or iPod touch, the USB cable that came with your device, and a keyboard and mouse, if necessary.
- Restart your computer and try again.
Note: To perform some of these steps, you need to be logged in to the computer as an administrator. If you are not sure if you have administrator access, contact the owner of the computer or the system administrator.
Following the steps listed above will resolve most update and restore errors. The alert message in iTunes may include one of the following error codes:
-1, 2, 4, 6, 9, 13, 14, 20, 21, 23, 26, 28, 29, 34, 35, 36, 37, 40, -48, -50, 1000, 1002, 1004, 1011, 1013, 1014, 1015, 1479, 1601, 1600, 1602, 1603, 1604, 1611, 1631, 1638, 1639, 2001, 2002, 2006, 2009, 3002, 3004, 3013, 3014, 3015, 3194, 3200, 9006, 9807, -9808, 9844, 4026xxxxx.
You can also visit this article for specific remedies and for advanced steps to resolve restore issues.