watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-09-23T17:04:06Z. The update package is 739.45 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: 0219f77a1f089268e455c089b3f711de9c22b5c3.zip.