watchOS 6.0 (build 17R5575a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-08-27T17:29:07Z. The update package is 684.47 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: 5ebef35ba18fb8ce03c3da665343343d397052f5.zip.