watchOS 6.0 (build 17R5566a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-08-15T17:17:08Z. The update package is 687.8 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: 49eafb5cae1bc3b7d830d749c7869ef2dab8826e.zip.