watchOS 4.2.2 (build 15S6542) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-01-19T18:08:48Z. The update package is 45.65 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f17d45757438d6ffc39fb8faf2a1cb1763d82829.zip.