watchOS 5.0 (build 16R5340g) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-08-06T17:11:55Z. The update package is 485.02 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: 1bec9ad6fea98be26380b88c9346d5a9e72e63e4.zip.