watchOS 5.2.1 (build 16U5101c) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2019-04-22T17:12:40Z. The update package is 104.35 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2122c9e356dc9308bf9c2265c9d20514cf5b3daa.zip.