watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-09-23T17:04:02Z. The update package is 415.45 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: a7ef89b3b99eaee656565b5fc6fac924ef3ea9fe.zip.