watchOS 4.1 (build 15R5843a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2017-10-16T17:06:12Z. The update package is 147.28 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: bcca256b12da8ca98fb831e3e93db73eb2f33cff.zip.