watchOS 5.0 (build 16R5334f) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-07-30T17:10:24Z. The update package is 377.6 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: c61beb9229ba899e2a3eb741526362ccd8b8bbc3.zip.