watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-08-07T17:13:58Z. The update package is 687.44 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6b14d35df5b3d548db11707681d2c925eabc1f3e.zip.