watchOS 5.0 (build 16R6364) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-09-12T19:18:52Z. The update package is 342.89 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: 36e9f11cba52158b84fab5f81a2fdfc45a7113e8.zip.