watchOS 5.0 (build 16R5283q) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-06-05T09:53:13Z. The update package is 574.98 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: 9fa83a89c175dd64ccb7a6a8ef666f31ec730626.zip.