watchOS 5.0 (build 16R5357a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-08-20T17:09:22Z. The update package is 343.15 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d4285bd2b29b195ddeecb796a4fd543a0374972b.zip.