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Problems updating or restoring iOS

This article will teach you how to troubleshoot iOS update or recovery.

First steps

  1. If you have a Mac with macOS Catalina 10.15, make sure it is up to date. If you have a Mac with macOS Mojave 10.14 or earlier or a PC, make sure you have the latest version of iTunes installed.
  2. If your device still cannot be recovered or you receive an "unknown error [error number]" message, try the steps in this article.

If you continue to receive the error message, follow the steps below.

Select error number or error message

Select a bug to learn how to do it:

  • 1, 2, 3, 4, 6, 9, 10, 11, 12, 13, 14, 16, 17
  • 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37,
    40, 53, 56
  • 1002, 1004, 1011, 1012, 1014, 1015
  • 1600, 1601, 1602, 1603, 1604, 1611, 1638, 
    1643–1650, 1667, 1669, 1671
  • 2001, 2002, 2005, 2006, 2009
  • 3002, 3004, 3013, 3014, 3015, 3194, 3200
  • 4005, 4013, 4014, 4037

Update software on your Mac or PC

If you see Error 10, your iOS device may have a newer version of iOS than your computer supports. Before you can update or restore your iOS device, you must update the software on your Mac or iTunes on Windows.

macOS 10.11 and newer:

  1. Disconnect and reconnect your iOS device from your computer. You may need to unlock your iOS device before your Mac can recognize it.
  2. If you get a message like "A software update is required to connect to your iOS device." appears, click Install to load and install the software so your Mac can update or restore your iOS device.

Windows: Update to the latest version of iTunes.

If you still see Error 10 or don't see a dialog box asking you to update the software on your Mac, contact Apple Support.

Make sure your device can communicate with Apple servers

If you see error 1671, your computer is about to load the required software. Wait for the download to complete, then try again.

If you see any of the following errors, 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
  • "An error occurred while downloading the software."
  • "The device is not suitable for the requested build."

Check the following:

  1. Make sure your computer can communicate with Apple's software update servers.
  2. Check your third-party security software.

Error 4037 occurs when your computer cannot update your device because it is locked with a passcode and has not been unlocked for update or restore. Unlock your device and try again. Here's what to do if you've forgotten your code.

If you continue to see an error, contact Apple Support.

"Update via cellular network failed" or "Apple Pay not available" message

If you either see the message "Cellular update failed" or the message "Apple Pay needs an update on this iPhone" after an update, here's what to do.

Check the security software

Check USB connections

If you see error 4005, 4013, or 4014, follow the steps in this article.

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

  • 13, 1600, 1601, 1602, 1603, 1604, 1611, 1643–1650
  • 2000, 2001, 2002, 2005, 2006, 2009
  • An error message that contains "Invalid Answer"

Check the following. After each step, check to see if the problem has been resolved:

  1. Use the USB cable that came with the device. If you don't have this on hand, try another Apple USB cable.
  2. Switch to a different USB port on your computer. Do not connect the device to the keyboard.
  3. Try a USB port on another computer.
  4. If you continue to see the error, check for other USB issues, check your third-party security software, and then check your hardware.

If you continue to see an error, contact Apple Support.

Check hardware

If you see Error 53, try the steps outlined in this article.

If you see any of the following errors, there may be a hardware problem:

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

Check the following. After each step, check to see if the problem has been resolved:

  1. If iTunes is already open, close the program and open it again.
  2. Check your third-party security software.
  3. Make sure the USB cable, computer, and network are working reliably. Then try to restore your device two more times.
  4. Search for outdated or changed software.

If you still see the error, contact Apple Support.

Check for outdated or changed software

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