watchOS 5.0 (build 16R5283q) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-06-05T09:53:08Z. The update package is 589.69 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: b2613d6b9c59c00b29661ee134b8aaa8244dc66f.zip.