watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-10-16T17:13:11Z. The update package is 521 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5dac4cf8c720a13c152244cf9e096c5230d3953c.zip.