watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 5 (44mm, LTE), released on 2019-10-16T17:14:11Z. The update package is 290.5 MB. This is a delta (partial) update that requires 6.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 324c8822a7c499a77514691cbc17d74856581697.zip.