watchOS 4.2.2 (build 15S6542) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-01-19T18:09:30Z. The update package is 66.6 MB. This is a delta (partial) update that requires 4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eb6cc969a0839f09aa3c487739c4a9f77a2cef14.zip.