watchOS 5.0 (build 16R5283r) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-06-11T17:07:16Z. The update package is 590.2 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: 8ad41debec22b391f1e3785eccce9f03d2c07eae.zip.