watchOS 5.2.1 (build 16U113) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-05-13T17:16:01Z. The update package is 822.81 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e440a7adf261e57a81e64eb29c0c82d7e3e0e2a3.zip.