watchOS 5.0 (build 16R5340g) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-08-06T17:11:58Z. The update package is 533.36 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: 5f866c1920c655b5e053fc7933f24cabb5905b76.zip.