watchOS 6.1 (build 17S5059e) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-10-02T17:10:21Z. The update package is 599.35 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: 394cb50e62874b9ac08fb5822fb27dd7b880a9bc.zip.