watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-10-23T17:12:15Z. The update package is 723.41 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: 34b7ce4ca177bbb903c478e2fac2e15e6b5e35f3.zip.