watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-03-18T17:14:46Z. The update package is 486.31 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: aee9cba86e2c934833b1a21138280c521504f273.zip.