watchOS 6.1 (build 17S5068e) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-10-10T17:07:25Z. The update package is 723.94 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c653512224d070f13ee6b5d607e2aea550fe64a8.zip.