watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-07-02T18:10:07Z. The update package is 221.55 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 380a251b9b0a92c1ef023748dd4477612b90fa91.zip.