watchOS 5.2 (build 16T225) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-03-27T22:03:47Z. The update package is 520.15 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c145ebf1f771fe301e7bd0f466aef4a8f3977bfa.zip.