watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-07-03T17:11:24Z. The update package is 638.11 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 38ed2a630d8a1635bba6495292a43fdc25e4c851.zip.