Why is my iPhone 6s downloading iOS 15.8 but not installing it?

My iPhone 6s can’t install iOS version 15.8 after I downloaded version 15.8. I can download but I can’t install only.

When I click on install button , this occurs verifying update and then unable to install update caption with this letter “an error occurred installing ios15.8.”

what should I do?

pls help me or give me some advice.


[Re-Titled by Moderator]

iPhone 6s, iOS 13

Posted on Nov 19, 2023 1:00 AM

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Question marked as Top-ranking reply

Posted on Nov 19, 2023 1:04 AM

If you still can't install the latest version of iOS, try downloading the update again:

  1. Go to Settings > General > [Device name] Storage.
  2. Find the iOS update in the list of apps.
  3. Tap the iOS update, then tap Delete Update.
  4. Go to Settings > General > Software Update and download the latest iOS update.

If you don’t see the update in the list of apps or if the issue happens again, you need to update your device with iTunes.


Try updating iOS after each step.

  • Try to Forget the WiFi network and add it again
  • Try another WiFi network 
  • Toggle sets automatically off and then on
  • Reset your network settings
  • Force restart your device
  • Remove any beta profiles, if applicable




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Why is my iPhone 6s downloading iOS 15.8 but not installing it?

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