With the release of watchOS 11.6.1 and companion iOS 18.6.1, Apple managed to restore blood oxygen readings for U.S. owners of Apple Watch Series 9, Series 10, and Ultra 2.
The method is slightly less convenient, as it shifts processing data and displaying results to the iPhone, but it restores a capability that had been entirely removed since late 2023. The timing works in Apple’s favor.
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