watchOS 6.1 (build 17S5068e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-10-10T17:09:16Z. The update package is 615.27 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: 3dae12f4af4c45060d7f4c55977615ce079b561e.zip.