watchOS 4.2.2 (build 15S5530d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2017-12-13T21:09:44Z. The update package is 88.88 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: 9ded8b10e9f69df9240944ef5924aa6f7412f055.zip.