watchOS 4.2.2 (build 15S5536a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-01-03T18:22:04Z. The update package is 182.27 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: 8d74d6cf6ae34546ee8b8cdf7f1d10412e077a04.zip.