watchOS 9.0 (build 14V5249a) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-03-20T16:59:47Z. The update package is 848.48 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: cdcbda41a69cdbcc3e5db74b202f163f76844217.zip.