watchOS 5.2.1 (build 16U113) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-05-13T17:17:10Z. The update package is 497.68 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: 08350d2f929461b0de9f54d8d7098630fabde061.zip.