watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-07-03T17:11:16Z. The update package is 627.25 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: acd7579509b2864c6d6c7fe690afc9af17259c0b.zip.