watchOS 4.1 (build 15R5835d) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-10-09T17:04:57Z. The update package is 285.4 MB. This is a delta (partial) update that requires 4.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d327387de4e2327f3b142769d5d78921b4d7263c.zip.