watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2018-01-19T18:08:04Z. The update package is 792.53 MB. This is a delta (partial) update that requires 2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0b2087fdae9d09c1586be7c3d2c2c38abb3d47b9.zip.