watchOS 9.0 (build 14S326) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-09-07T21:33:16Z. The update package is 795.74 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: 30a50343c13ef7f696a1455c9d63c40bbb1890dd.zip.