watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-01-19T18:08:44Z. The update package is 182.22 MB. This is a delta (partial) update that requires 4.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c395a3f84cce4c89948a4c73e48c6b494d16c41a.zip.