watchOS 6.0 (build 17R5571a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-08-21T17:11:53Z. The update package is 166.44 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: a55d505aaad5a488249720a22898f57236d78097.zip.