watchOS 6.0 (build 17R5546f) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-07-30T17:10:23Z. The update package is 797.82 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0166495b721d427f8cf5afdf45adb06e3fed5009.zip.