watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-08-07T17:15:02Z. The update package is 687.3 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: 89a0c114fca454791936108fda3aff0198d378ea.zip.