watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-07T17:14:07Z. The update package is 829.16 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ba0cbcc1d8f962bb72f11ad76ad8bf48d2b41909.zip.