watchOS 6.0 (build 17R5491t) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-06-03T19:29:11Z. The update package is 805.96 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8441191754fb674d7ff4fcec0444abb5cf4a20f2.zip.