watchOS 3.1 (build 14S6452) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-09-21T17:00:52Z. The update package is 316.02 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: c598d4931884e3516d23c477ec055e1f397ad1fe.zip.