watchOS 6.1 (build 17S5083a) is an official Apple over-the-air update for the Apple Watch Series 5 (40mm, LTE), released on 2019-10-23T17:13:00Z. The update package is 290.27 MB. This is a delta (partial) update that requires 6.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e787ba119ecf0586827dc0ce9c1e90a8f793c65.zip.