watchOS 4.2.2 (build 15S5536a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-01-03T18:22:41Z. The update package is 42.84 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b82f74be482cb5f0903543631271dd325c4b9e5e.zip.