watchOS 5.0 (build 16R5357a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2018-08-20T17:09:28Z. The update package is 620.91 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e9fc420ce3b22cac7d7c10112289dcaa0464c6e9.zip.