watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-10-23T17:12:47Z. The update package is 365.19 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: de5d33a2be61b4327497e793e791d6aa4ca63d63.zip.