watchOS 4.2.2 (build 15S5536a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-01-03T18:22:40Z. The update package is 63.43 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: ea32ec67e4846eb296c9ba0e27a622c61221c1b1.zip.