watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-10-23T17:12:13Z. The update package is 723.64 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: 691fd2d43e0fac3fa0797e91469b80f670f32c5d.zip.