watchOS 6.0 (build 17R5532f) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2019-07-17T17:43:15Z. The update package is 663.01 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: 7c4168ebfb064bd3d76d4e453e5fb37f0effdc1d.zip.