watchOS 5.2.1 (build 16U5113a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-05-07T17:18:36Z. The update package is 121.32 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 96d8b32a95cc637903329595c4d96df2d9c08be8.zip.