watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-09-23T17:04:05Z. The update package is 739.41 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4a9a6a50d8eefa49d3de3c07eb94353f8808d9ef.zip.