watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-01-19T18:08:52Z. The update package is 147.05 MB. This is a delta (partial) update that requires 4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 356605ccb1d70be88dd7900824e28d877095f931.zip.