watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-09-23T17:04:14Z. The update package is 742.97 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: 76fd86e0560f7759a3d7e52be05c925264eff737.zip.