watchOS 5.2.1 (build 16U5101c) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-04-22T17:12:41Z. The update package is 448.39 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7f1e10ece6fed57978b405970da9f0af287e02ac.zip.