watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-09-23T17:04:19Z. The update package is 709.81 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bc2e4038beaf243386570c83105696275bc22265.zip.