watchOS 5.2.1 (build 16U6113) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-05-13T17:17:27Z. The update package is 94.32 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: f54c5a81f60d6822ff6e6ad9dec295979c61884a.zip.