watchOS 6.0 (build 17R5491t) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-06-03T19:29:23Z. The update package is 694.45 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f54d9d93b92021b213a3965eff11cf0e6db9cbc3.zip.