Cannot update watch because phone won’t update
I cannot update my watch until I update my phone. However, my phone won’t update to iOS 17. How can I update my watch?
Apple Watch Series 6, watchOS 9
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watchOS 10 requires an iPhone that has iOS 17 installed, and you can only pair an Apple Watch running watchOS 10 with an iPhone having iOS 17 already installed.
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copied from: Set up and pair your Apple Watch with iPhone - Apple Support