watchOS 6.0 (build 17R575) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-09-11T18:35:28Z. The update package is 710.95 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: 445137520722b6c420bab808f2447f8c5a237b2d.zip.