watchOS 6.0 (build 17R5532f) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-07-17T17:42:01Z. The update package is 677.24 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 88f546455f613eba308c92d19e197f814998cbe6.zip.