watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-10-16T17:13:00Z. The update package is 779.27 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: c1d01a6870320dffb9f5115f74c5f164e8f2b4d0.zip.