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Apple Watch Ultra 1 WatchOS update fails after iPhone iOS upgrade

Hello


Last night I upgraded my iPhone to 27.1. I now cannot pair my Apple Watch Ultra 1 as it needs to be upgraded to WatchOS 26.6 (this model cannot go up to WatchOS 27).


When I choose Install, I see the message Verifying... and then a pop up appears stating "Unable to install Update". I then get two options Close (which doesn't seem to work on 27.1 but does on 27.2 Beta) and Open App. If you choose Open App, you can select Install again. The same thing happens.


I have tried the following with no luck:

  • Factory Reset the AppleWatch
  • Factory Reset the iPhone (I cannot downgrade to iOS 26)
  • Rebooted both the AppleWatch and iPhone
  • Deleted the Watch app and reinstalled
  • Change the language and localisation on the AppleWatch and iPhone
  • Upgraded to 27.2 Beta - the Close button now works (but the AppleWatch does not :( )


I do not have another iPhone (I was trying to see if I can upgrade the Watch using iOS 26) and I don't have anyone to reach out to either.


I have spent pretty much the whole day trying a combination of things, with no luck, and I am now out of ideas.


I have attached screenshots of what I have been experiencing:





Thanks

Harris

2 replies

I had read that the Ultra 1 could no longer be updated to watchOS 27...

Yep, 26.6 is the last major release but it keeps failing every time it tries to upgrade to that.