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 740.38 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: 2df9c9896e7916a3da8614ee912f8af53228817c.zip.