watchOS 5.2 (build 16T5181f) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-01-24T18:07:42Z. The update package is 420.75 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 04a11c30f1e81ae352679bafe2dc3ddc6d5da604.zip.