watchOS 6.1 (build 17S5054e) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-09-23T17:03:56Z. The update package is 691.53 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b03d4f860cfcc1d5a2f0115df7136040485992ee.zip.