watchOS 5.0 (build 16R5283r) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-06-11T17:07:04Z. The update package is 622.04 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: e76747ea3e8440a1cf2a2d2fda8ecc1524b6cb29.zip.