watchOS 4.1 (build 15R846) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2017-10-20T17:05:56Z. The update package is 145.76 MB. This is a delta (partial) update that requires 4.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eccf7770c8cb4c6d518d0c4a586dad07e467067f.zip.