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 708.76 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: 0e3e27cabce63b09ef972345038e15bd3784edc5.zip.