watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-10-16T17:12:53Z. The update package is 642.6 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5d91f274a03d985c8084d80264280e583746e330.zip.