watchOS 5.0 (build 16R5283r) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-06-11T17:06:59Z. The update package is 569.86 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ccb7d0e7b89663b9a1948c159a990a14e084dc11.zip.