watchOS 5.0 (build 16R5283q) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-06-05T09:53:01Z. The update package is 603.45 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6ede4ac2608da9d57891bd8d1255dba795468f1e.zip.