watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-06-17T17:11:43Z. The update package is 720.08 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a9d6fa5f92dd6bbe994cab59df370c83cc130846.zip.