watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2018-01-19T18:08:05Z. The update package is 792.49 MB. This is a delta (partial) update that requires 2.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cbc53cbc26ecc5c7dce44c667a8f22f03991ac30.zip.