watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-08-07T17:13:54Z. The update package is 689.21 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: 134db44c511feb34fdf94503d0ec6c57722440c6.zip.