watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-07-03T17:11:12Z. The update package is 568.45 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: a7a4035c0be1d4640371f15a2bcf34c143a26167.zip.