watchOS 6.0 (build 17R575) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-09-11T18:34:51Z. The update package is 739.65 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: c4321513e39b51cd5f7d8dff170af3b97c9f7079.zip.