watchOS 6.0 (build 17R5546f) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-07-30T17:09:33Z. The update package is 685.54 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: 13b0ad50c97e714acd070ae704330166f74feb6b.zip.