watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-07-17T17:11:23Z. The update package is 647.52 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 28ba9d001d7b9218e58f3523bbbcfc6b02c60978.zip.