watchOS 9.0 (build 14V485) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-05-15T16:55:44Z. The update package is 832.26 MB. This is a delta (partial) update that requires 8.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a0fd77069e464f815d1c037d2cc4a008e1f7c1ff.zip.