Unknown error occured (-1) when trying to restore iphone 7

An unknown error occurred (-1) when trying to restore an iphone 7. My problem with my phone was that I had a no service issue, could not receive or send text messages or calls. Only had the phone 6 months and it has no damage. Before I tried to restore it I could get on the internet on my phone and see all the apps and everything on it, but now that I tried to restore it, the phone is frozen on the restore screen. I sent it in to the apple repair store and they sent it back saying they could not repair it, no other explanation. Only that they could not duplicate the issue, whatever that means. Now I am told to send it back in again for another look.

Posted on Sep 9, 2018 11:10 AM

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4 replies

Sep 9, 2018 11:12 AM in response to michelemarie

Check your hardware


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 Check for outdated or modified software.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.



Get help with iOS update and restore errors - Apple Support

Sep 13, 2018 4:12 PM in response to Carolyn Samit

My error message was (-1). I tried 1,2,3,and 4. I also contacted apple support and was on the phone with them twice for over an hour each time, with each representative asking me to do the same steps over and over again. I even tried to restore the iphone on a different computer with the same results. I was told by the apple store that the no service issue was a known defect on the iphone 7 and it would be under warranty but I had to send it in first. The first time I sent it in they sent it back saying that they could not duplicate the problem, probably because as of now the phone is frozen, so of course they can't see the "no service" issue I had with it.

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Unknown error occured (-1) when trying to restore iphone 7

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