watchOS 6.0 (build 17R5546f) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-07-30T17:10:21Z. The update package is 678.42 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: f859c3ef461584b81978c95f6eaf6019cde559ea.zip.