watchOS 9.0 (build 13V601) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-06-06T17:14:50Z. The update package is 537.5 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: 51633eebb09ae9822a8acf026c1c826726e0de91.zip.