watchOS 4.1 (build 15R846) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2017-10-20T17:05:58Z. The update package is 122.21 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: d28fbb4620fb6b0aa276a07b738eaeda6cdc55f7.zip.