watchOS 4.2.2 (build 15S6542) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2018-01-19T18:08:18Z. The update package is 55.13 MB. This is a delta (partial) update that requires 4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6de1cbc546bd3ec9c2fa0c53802d29fe5665d6a9.zip.