watchOS 5.0 (build 16R5334f) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-30T17:09:55Z. The update package is 652.34 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: f12b1b7dd7011eef4da5daeeb65b912cfd2219df.zip.