watchOS 4.2.2 (build 15S542) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-01-19T18:09:03Z. The update package is 572.47 MB. This is a delta (partial) update that requires 3.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6333835ce1e2e4705b059b05b7581579675b7261.zip.