watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-06-17T17:12:52Z. The update package is 681.5 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: 5765e1cc8b8e14749683c67d136a1d1b05ab57d8.zip.