watchOS 6.0 (build 17R5571a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-08-21T17:10:25Z. The update package is 684.49 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: 987737b0d012d2a10e0d5dd75fadc0323f0dfe33.zip.