watchOS 5.0 (build 16R6364) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-09-12T19:19:31Z. The update package is 356.02 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: 166f2fa36ba094240b2d07908e424fe7a60a4e9c.zip.