watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-10-16T17:12:50Z. The update package is 776.27 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: 0f0fd7ef942c39856a65df0d6d2c1f6fb9c9e3b1.zip.