watchOS 5.0 (build 16R5283q) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-06-05T09:53:05Z. The update package is 611 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: f66dca98ba00d1e79884d50bdef0c8a679832f8b.zip.