watchOS 4.2.2 (build 15S6542) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-01-19T18:09:32Z. The update package is 49.22 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d9351e0ddc91b7ca83857b8e93465c83a916644f.zip.