watchOS 5.2.1 (build 16U113) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-05-13T17:15:58Z. The update package is 1003.34 MB. This is a delta (partial) update that requires 3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fb8669da3bd7ec8d4b024757d08e4b5326587486.zip.