watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-07T17:14:08Z. The update package is 748.19 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: e48927db3f5bd957cd27fd7f02f41a6874ed6ede.zip.