watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-07T17:14:11Z. The update package is 741.18 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: 79b9518d26ba0a0df56b977f635ef0c4e5139592.zip.