watchOS 4.1 (build 15R5835d) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-10-09T17:04:42Z. The update package is 122.18 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: ae313bd19b44480881e64a6577be9edbc597b7f2.zip.