watchOS 4.1 (build 15R5835d) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-10-09T17:04:40Z. The update package is 312.78 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: fd5f57347b8c98e79421b5278dd9123c0c4ffaf9.zip.