watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-08-07T17:13:46Z. The update package is 692.15 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 52668e569a9f2a134c23873f8bfb19aea3cf5b59.zip.