watchOS 5.0 (build 16R5349a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-08-13T17:06:59Z. The update package is 519.3 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: dcc575a08e0c647e674c4f5ca074c87af74b88d1.zip.