watchOS 6.0 (build 17R575) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-09-11T18:35:09Z. The update package is 742.97 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e24df91f82ea8d8fa5479d5664c078bba41c7107.zip.