watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-08-07T17:14:56Z. The update package is 688.28 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: 161626a1d3c33693c4c0b7687f7ec6afdc12e807.zip.