watchOS 9.0 (build 14S959) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-01-09T17:56:24Z. The update package is 810.4 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8012c768c90123753ff44838dd7b7d7f3a653cee.zip.