watchOS 6.0 (build 17R5575a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-27T17:30:19Z. The update package is 740.24 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: c668f1ae9f3cce9df3b804f17828ab987dee5e71.zip.