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Question: iPhone 8 stuck in loop since upgrading to 11.1.1

I upgraded to iOS 11.1.1 and it has left my iPhone 8 stuck in a recovery loop. I have tried all the solutions listed on the Apple website to no avail.

Apple care couldn't help and have booked in an appointment to an Apple store which leaves me without a phone for 2 days and I need it for work. It is stuck in recovery mode and after successive tries it either gives an error code 21 or error code 9.


iOS 11.1.1 is broken. The phone was working perfectly fine before the update. When I am paying £800 for a phone, I expect it to work longer then a month.

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Nov 12, 2017 10:41 AM in response to Cgd12345 In response to Cgd12345

Error 21:


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 Check for outdated or modified software.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.


Error 9:

If you see error 9, 4005, 4013, or 4014 when you restore your iOS device

When you try to update or restore your iPhone, iPad, or iPod touch, you might see one of these messages in iTunes.

Try to update your iOS device again

If your iOS device disconnects during the update or restore or if iTunes couldn't tell the device to restore, you might see one of these messages:

  • The iPhone [device name] could not be restored. An unknown error occurred (9).
  • The iPhone [device name] could not be restored. An unknown error occurred (4005).
  • The iPhone [device name] could not be restored. An unknown error occurred (4013).
  • The iPhone [device name] could not be restored. An unknown error occurred (4014).

Try these steps:

  1. Install the latest version of iTunes.
  2. Force your device to restart:
    • On an iPhone X, iPhone 8, or iPhone 8 Plus: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the Apple logo.
    • On an iPhone 7 or iPhone 7 Plus, press and hold both the Side and Volume Down buttons for at least 10 seconds, until you see the Apple logo.
    • On iPhone 6s and earlier, iPad, or iPod touch, press and hold both the Home and Top (or Side) buttons for at least 10 seconds, until you see the Apple logo.
  3. Connect your device to your computer using a USB cable.
  4. When iTunes asks you to update or restore, click Update (not Restore) to reinstall iOS and keep your personal data.

If you still need help, try these steps

If you can update, but your device starts up in recovery mode, follow the steps above again. On step 4, choose Restore instead of Update. After the restore completes, you need to set up your device from a backup.

If you continue to see an error during the update:

  1. Check for updates to your Mac or PC. If you restart your computer for an update, check for updates again after you restart.
  2. Try to restore your device using another USB cable.
  3. Try to restore your device on another computer.

If you continue to see error 9, 4005, 4013, or 4014 when you try to restore your iPhone, iPad, or iPod touch, contact us.

Nov 12, 2017 10:41 AM

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Nov 12, 2017 11:25 AM in response to liv0123 In response to liv0123

Thanks for the reply, I tried all the steps above. I am running HighSierra and iTunes is up to date. The USB cable I am using is the apple supplied cable that came with the phone. i followed all of the above steps over and over. There was no problem with the phone up until the 11.1.1 update. It was shortly after that the phone started to randomly restart, then it just got stuck on a black screen. Once I got it to boot off the black screen it got stuck on the Apple logo, now it is stuck in recovery mode and doesn't seem to want to go beyond that. I have to see what happens when I go to the Apple store, but really not impressed with this.

Nov 12, 2017 11:25 AM

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Question: iPhone 8 stuck in loop since upgrading to 11.1.1