watchOS 5.2.1 (build 16U5113a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-05-07T17:18:33Z. The update package is 464.66 MB. This is a delta (partial) update that requires 5.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 698b372562db51f708c3ddb92b253928fbdde673.zip.