watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2019-10-23T17:12:08Z. The update package is 347.21 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: ba68041a7940a8bded5d26f6eca146b99fa76726.zip.