watchOS 5.0 (build 16R5334f) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-07-30T17:10:01Z. The update package is 653.04 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 80f9bd77b69ab2939fd68e218f093d7fa3a9ce39.zip.