watchOS 9.0 (build 13V5098f) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-01-12T02:34:41Z. The update package is 540.82 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: bd826cfe75e1fa5cd8c2e95a08c4a79d2d439c9d.zip.