Get help with iOS update and restore errors

Learn how to solve iOS update and restore errors.

Try these steps first

  1. Get the latest version of iTunes. To update iTunes, you might need OS X Mavericks 10.9.5 and later or Windows 7 and later.
  2. If your device couldn't be restored and you get a message that "an unknown error occurred [error number]," use these steps

If you still see the error, try the steps below.

Choose your error number or message

To learn what to do, choose your error:

Make sure that your device, Apple, and iTunes can communicate

If you see error 1671, iTunes is downloading necessary software. Wait for the download to finish, then try again. To see how long the download should take, click the down arrow in the upper-right corner of iTunes.

If you see one of the errors below, your computer might not be able to connect to Apple servers or your iPhone, iPad, or iPod touch:

  • 17, 1638, 3014, 3194, 3000, 3002, 3004, 3013, 3014, 3015, 3194, 3200
  • "There was a problem downloading the software."
  • "The device isn't eligible for the requested build."

Here's what to check:

  1. Make sure that iTunes can communicate with the Apple software-update servers.
  2. Check your third-party security software.

If you still see an error, contact Apple Support.

Check your security software

Check your USB connections

If you see error 4005, 4013, or 4014, use these steps.

If you see one of the errors below, check your USB connection, USB cable, USB port, or computer:

  • 13, 14, 1600, 1601, 1602, 1603, 1604, 1611, 1643–1650
  • 2000, 2001, 2002, 2005, 2006, 2009
  • An error that includes "invalid response"

Here's what to check. Try again after each step:

  1. Use the USB cable that came with your device. If you don't have it, try a different Apple USB cable. 
  2. Switch to a different USB port on your computer. Don't plug into your keyboard.
  3. Switch to a USB port on a different computer.
  4. If you still see the error, check for other USB issues, check your third-party security software, then check your hardware.

If you still see an error, contact Apple Support.

Check your hardware

If you see error 53, use these steps.

If you see one of the errors below, you might have a hardware issue:

  • 1, 3, 10, 11, 12, 13, 14, 16
  • 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 56
  • 1002, 1004, 1011, 1012, 1014, 1667 1669

Here's what to check. Try again after each step:

  1. If iTunes is already open, quit and reopen it.
  2. Check your third-party security software.
  3. Make sure that your USB cable, computer, and network are reliable. Then try twice more to restore your iOS device.
  4. Check for outdated or modified software

If you still see the error, contact Apple Support.

Check for outdated or modified software

If you see error 1015 or a message that "the required resource can't be found," your device might have unauthorized iOS modifications (jailbreaking). Or you might be trying to install an earlier version of iOS (downgrading). 

To restore your device to the latest version of iOS, use recovery mode.

If you still see an error, contact Apple Support.

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