watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-01-19T18:08:43Z. The update package is 573.5 MB. This is a delta (partial) update that requires 3.2.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: da05d65fa8cf24807b0e99fdbf415ffe7758cecb.zip.