watchOS 5.2.1 (build 16U5079d) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-03-28T17:10:56Z. The update package is 159.18 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: 34daf118a1fd6fb94d552fff141ce64680ed13cf.zip.