Cannot update iPhone 12 Pro to iOS 14.8

I cannot update my iPhone 12 Pro to iOS 14.8. Update does not download and errors out. Root cause of error is not in error message.


I have followed the procedure on this site. I have power to my iPhone. I have a stable WiFi connection. I have 80% of storage available on my iPhone

Posted on Sep 20, 2021 5:58 PM

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Posted on Sep 21, 2021 7:50 AM

Any further luck with the long-form tip that I linked? Usually if everything else is normal there’s either not enough space (it needs 6 GB) or there is an old update download blocking it. To check for this go to Settings/General/iPhone Storage and look for an old update file. If you find one delete it.

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Question marked as Top-ranking reply

Sep 21, 2021 7:50 AM in response to rebeccafromwoodinville

Any further luck with the long-form tip that I linked? Usually if everything else is normal there’s either not enough space (it needs 6 GB) or there is an old update download blocking it. To check for this go to Settings/General/iPhone Storage and look for an old update file. If you find one delete it.

Sep 20, 2021 6:01 PM in response to rebeccafromwoodinville

80% isn’t important. At least 5GB free may be required.


To update all of these requirements must be met:

  • You must be connected to a Wi-Fi network (and not a personal hotspot) unless it is an iPhone 12 series with an active 5G network connection
  • The phone must be charged to at least 50%, and preferably plugged in so it stays above 50% during the update
  • The phone must not be in Low Power Mode
  • The phone must not be connected through VPN
  • The phone cannot be in Airplane mode


If verifying the above here is additional information→Updating iOS: common issues and solutions - Apple Community

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Cannot update iPhone 12 Pro to iOS 14.8

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