watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 5 (40mm, LTE), released on 2019-09-23T17:05:03Z. The update package is 254.95 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 057398f2bca5a196bcbc0af3e6eca2329993c682.zip.