watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-10-23T17:10:51Z. The update package is 776.18 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: f2151b1a3287d9f70336c8aa72eebd2176b63807.zip.