watchOS 5.2.1 (build 16U5110a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-04-29T17:38:34Z. The update package is 449.59 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: db123519d7c821fca198dff39a9289788938f413.zip.