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 627.12 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 85202c97396a56cf346819c89d26085bad043ade.zip.