watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-10-16T17:12:48Z. The update package is 90.79 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: f237f41bfdf322d06ff090eaec854d53fa025232.zip.