watchOS 5.2 (build 16T225) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-03-27T22:03:41Z. The update package is 439.24 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c51308b7978b784a220f79194d3315faf8ca65cf.zip.