Get help with iOS update and restore errors

Learn how to solve specific iOS update and restore errors.

When you update or restore your iPhone, iPad, or iPod touch in iTunes, you might see this message: "The iPhone [device name] could not be restored. An unknown error occurred [error number]."

Find your error number

If you tried the basic steps and still see the error message, click your error number and follow the advanced steps below.

Solve network errors

Errors: 17, 1638, 3014, 3194, 3000, 3002, 3004, 3013, 3014, 3015, 3194, 3200. You might also see these alert messages:

• There was a problem downloading the software.
• The device isn't eligible for the requested build.

These alerts mean that your computer is either having difficulty contacting the Apple update server or communicating with your iPhone, iPad or iPod touch.
Check your computer for software or settings that might cause communication issues between your computer and Apple or between your computer and your device.

Check your security software

Errors: 2, 4, 6, 9, 1611, 9006:
Sometimes security software can stop your computer from communicating with either the Apple update server or with your iPhone, iPad or iPod touch. Check your security software and settings to make sure that they aren't blocking a connection to the Apple servers.
If you still see the error message, check for USB connection issues.

Check your USB connections

Errors: 13, 14, 1600, 1601, 1602, 1603, 1604, 1611, 1643-1650, 2000, 2001, 2002, 2005, 2006, 2009, 4005, 4013, 4014. You might also see a message that includes "invalid response."
If the USB connection between your iPhone, iPad or iPod touch and computer is interrupted, you might not be able to update or restore.
To narrow down the issue, try different equipment:

• Use the USB cable that came with your device, or a different Apple USB cable. 
• Plug your cable into a different USB port on your computer. Don't plug it into your keyboard.
• Try a different computer.
• Solve other issues with the USB connection, then with your security software.

If you still see the error message, check for hardware issues.

Check for hardware issues

If you see error 53, learn what to do.
Errors: 1, 3, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 56, 1002, 1004, 1011, 1012, 1014, 1667, and 1669.
Your iPhone, iPad, or iPod touch or computer might have a hardware issue that stops the update or restore from completing.

1. Check that your security software and settings aren't blocking your device from communicating with the Apple update server.
2. Try to restore your iPhone, iPad, or iPod two more times while connected with a cable, computer, and network you know are good.
3. Make sure that your security software and settings are allowing communication between your iPhone, iPad, or iPod touch and update servers.
4. If you still see the error message when you update or restore, contact Apple support.

If you still see the error message, check for outdated or modified software.

Check for outdated or modified software

Error: 1015. You might also see the message "The required resource can't be found."
These errors might appear if any of the situations below are true:

• Your version of iTunes is out of date. Get the latest version of iTunes, then try to update or restore again.
• Your device has a beta version of iOS.
• You're trying to install an earlier version of iOS (downgrading).
• Your device has unauthorized modifications to iOS, also called "jailbreaking."

Use recovery mode to restore your device to the latest version of iOS.

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