Apple confirmed that watchOS 27 will not support the Apple Watch Series 9, Ultra (first generation), or SE (second generation). The update only runs on Series 10, Series 11, Ultra 2, Ultra 3, and SE 3 models. This represents a dramatic shift in Apple's software support strategy.

Previously, watchOS 26 maintained compatibility with Series 6 and later models, plus all Ultra variants. That meant four years of devices could run the latest software. The new requirements cut off support for models that still used the S9 or S10 chip, creating an unusual situation where hardware capability doesn't determine eligibility.

Notably, the Apple Watch Ultra 2 contains the same S9 chip as the Series 9 but still receives watchOS 27 support. This selective approach suggests Apple is prioritizing newer form factors over raw processing power. Users with affected models will need to upgrade to access new health features and performance improvements.

The decision leaves millions of Watch owners stuck on older software versions, potentially fragmenting the ecosystem ahead of the Series 12 launch. Apple's aggressive support cutoff could accelerate upgrade cycles but may frustrate customers who recently purchased compatible hardware.