Apple today confirmed that watchOS 27 will not support the Apple Watch Series 8, Apple Watch Ultra (first generation), or Apple Watch SE (second generation), effectively drawing a line at devices equipped with the S9 or S10 chip. The only Apple Watch models compatible with watchOS 27 are the Apple Watch Series 9, Series 10, Series 11, Ultra 2, Ultra 3, and SE 3. The cuts are the biggest loss of latest generation software support for the Apple Watch to date.