watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-17T17:10:59Z. The update package is 631.92 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d2e3838b749c94d9fb0a078d838b4a6d56621371.zip.