watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-09-23T17:03:50Z. The update package is 686.98 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: c8efbb2fe7266abd298db4b92ec088c6e40268d5.zip.