watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-10-23T17:12:21Z. The update package is 339.64 MB. This is a delta (partial) update that requires 6.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 89a4073bf2bc44246d9e6fa767b69f994d561a74.zip.