watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-01-19T18:09:29Z. The update package is 150.68 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: 9ce2c79af9181b9cb94e4885781377bada2e002a.zip.