watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-08-07T17:15:04Z. The update package is 264.63 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: 448633b8435d19d15982a4cacb5e26e4f42c7834.zip.