watchOS 4.1 (build 15R5835d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2017-10-09T17:05:23Z. The update package is 124.16 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: d66cb7b1c0435bcd709d2d9395f523a72821041f.zip.