Just got the new Iphone 15 and was able to stay on Watch OS9 using “transfer from Iphone to Iphone” It does not update the watch. I do believe if you restore from Icloud or factory reset you have to update the watch because it has to be re-paired. Just thought I’d let anyone no who is hesitant to upgrade, that it is possible to stay on Watch OS9.
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I do believe if you restore from Icloud or factory reset you have to update the watch because it has to be re-paired.
As long as your WatchOS version is supported by your iOS version, you don’t need to upgrade even if you unpair and re-pair the watch