watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-08-07T17:15:34Z. The update package is 171.32 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c47976dadbf45e5a8b511b19ef81103f576d4975.zip.