watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-10-16T17:14:02Z. The update package is 105.04 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: 7fec118314455a2ba78d996a5bb9d1dd957f6786.zip.