watchOS 6.0 (build 17R6575) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-09-11T18:34:56Z. The update package is 1.4 GB. This is a delta (partial) update that requires 17R5575a already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1e689df44a5560ce21f1a28930c9b4c62c39c33a.zip.