watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-07-17T17:11:08Z. The update package is 689.58 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: 201f063dff27206bc1c9b78af06f5d71d655d0f0.zip.