watchOS 4.2.2 (build 15S5530d) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-12-13T21:09:13Z. The update package is 55.7 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: 7ad7d4dc1970f01f83980bc49167a25b37e9f908.zip.