watchOS 6.0 (build 17R5575a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-08-27T17:29:05Z. The update package is 684.65 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: 9a3ae7284b5fc72258968685dea2b56749c2e308.zip.