watchOS 4.2.2 (build 15S5530d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2017-12-13T21:09:49Z. The update package is 60.51 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: 4ae3b9e55e98784f23c1d95d8d565baa2e66b010.zip.