watchOS 6.1 (build 17S5059e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-10-02T17:11:21Z. The update package is 574.8 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: fc7e424b85e3cb866061cb7869af96a8eda275cb.zip.