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 659.88 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: e512eb5a343ca686efe6f0cb6429b55d1d67527c.zip.