watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-08-07T17:13:50Z. The update package is 684.92 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: 913db285edb056d2882d5a30fa5dc3bb535eed15.zip.