watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 5 (40mm, LTE), released on 2019-10-16T17:14:07Z. The update package is 358.73 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: 4e77e5239b4e477e3382c94a9d2068dbaeee6ed4.zip.