watchOS 3.1 (build 14S452) is an official Apple over-the-air update for the Apple Watch (38mm), released on 2016-09-21T17:00:40Z. The update package is 50.42 MB. This is a delta (partial) update that requires 3.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dd94665805fd3d80b4708e1fc42dfeeb438f6741.zip.