watchOS 5.0 (build 16R5340g) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-08-06T17:11:51Z. The update package is 244.82 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4bf63801d9ab6e3e8d1f44a8d90fad1ed383720a.zip.