watchOS 9.0 (build 13V5117c) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-02-08T17:55:32Z. The update package is 542.41 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: e03d7c2932d6d2a067923713bff44d7b9164c7c4.zip.