How to fix iTunes Unknown Error 1100 while restoring iPhone 12/7

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iPhone 12,11,iPhone X/XR and iPad users are facing issue while updating the iPhone to the latest iOS version, that while updating and restoring the iPhone iTunes is giving error 1100. Due to this the iPhone users is not able to restore the iPhone and iTunes keep on  showing error (-1100) when attempting to restore


iTunes 1100 error


The error message shown on iTunes is “The iPhone  could not be updated. An unkown error occurred (1100)” and it's not in the list of known errors.

Most of the time iTunes error are related to system software and these error are unlikely linked to your device (iPhone or iPad). To fix the iTunes error 1100 we have listed some workaround, please try them and let us know in the commet sections. 


How to fix iTunes 1100 error while updating /restoring iPad, iPhone 12,11,Xr,X,XS Max/ iOS 14


Fix 1: Update the iTunes to latest version

Please make sure that for updating the iPhone or iPad to latest version you should always use latest iTuenes. Please check iTunes pending update, if any, update to the latest version before trying iPhone restore.


Fix 2 : Downgrade the iTunes


If you are already on the latest iTunes version, and still the restore is not working for your iPhone, then we recommend you to switch to older version of iTunes and see if it works fine to restore the iPhone.


Fix 3: General iTunes Troubleshooting steps

  1. Disconnect and then reconnect your iOS device to your computer. You might need to unlock your iOS device before it is recognized by your Mac.


  1. Use the USB cable that came with your device. If you don't have it, try a different Apple USB cable. 


  1. If iTunes is already open, quit and reopen it.


  1.  check your third-party security software. 


  1. Use the USB cable that came with your device. If you don't have it, try a different Apple USB cable. 


  1. Switch to a different USB port on your computer. Don't plug into your keyboard.


  1. Switch to a USB port on a different computer.


  1. Make sure that your USB cable, computer, and network are reliable. Then try twice more to restore your device.




If you still see an error, contact Apple Support.


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