watchOS 6.0 (build 17R5532f) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-07-17T17:41:55Z. The update package is 667.42 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9291e4c8f40dd454e3c37109023ca12afc5d934d.zip.