watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-08-07T17:15:32Z. The update package is 554.54 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: 01f4d3bd51f9b8a92bcc5d3fc56143aabdf31b24.zip.