watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-10-16T17:12:53Z. The update package is 776 MB. This is a delta (partial) update that requires 5.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ab96820515e3a40f0e00873b1c9be8bbf937f436.zip.