watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-10-23T17:10:48Z. The update package is 263.6 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: 2009f747d5bd00a044dad8a7f1bdfe4518c99dec.zip.