watchOS 6.0 (build 17R5491t) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-06-03T19:28:22Z. The update package is 750.81 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b4706dfebb647a4c516bcfd4128a376fa0f1bd74.zip.