watchOS 6.0 (build 17R5566a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-15T17:17:54Z. The update package is 460.18 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f1133c3ce57defe49d492a8aba1b9fa00c878a59.zip.