watchOS 3.1 (build 14S464) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-10-04T17:25:17Z. The update package is 564.21 MB. This is a delta (partial) update that requires 2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 876f1c83be248347ba61b41d6d7d989a8ab4bdda.zip.