watchOS 6.0 (build 17R5546f) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-07-30T17:10:35Z. The update package is 709.67 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: 30a547f9e06997913eecff7f54700257df7a7b2b.zip.