watchOS 4.1 (build 15R5835d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2017-10-09T17:05:21Z. The update package is 1.56 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9401a830577ef88fa26fcb0427d251f3cbff45c2.zip.