watchOS 5.2.1 (build 16U113) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-05-13T17:16:00Z. The update package is 830.8 MB. This is a delta (partial) update that requires 4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 76504bb12df09bcd2a23b33daa6fdea11c199c65.zip.