watchOS 6.1 (build 17S5059e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-10-02T17:10:57Z. The update package is 686.44 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bf87f59b7ae3a4ea194582458a4471d9722704be.zip.