watchOS 6.0 (build 17R5491t) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-06-03T19:29:12Z. The update package is 691.61 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: e0bdca01069dda383d28917e2e2f44cf3252902b.zip.