watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-07-17T17:11:02Z. The update package is 657.38 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dfa21ac7f09abcbbe1462c38e75130c1f2bba978.zip.