watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-07-03T17:11:28Z. The update package is 607.89 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: 03cd59d2e0cdd4b1caa7834c92283b0e1a0f3018.zip.