watchOS 5.2 (build 16T225) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-03-27T22:03:26Z. The update package is 823.09 MB. This is a delta (partial) update that requires 4.2.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 36970a9b888d0a3d177144c3dbbbf23b84d230ac.zip.