watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-10-16T17:12:34Z. The update package is 724.08 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: e698f4eb7a1657c76b3914e3498fe6001bb30c9d.zip.