watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-09-23T17:04:41Z. The update package is 687.23 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0997f19065996ffaf951650d3b79c5d839e5861c.zip.