watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-03-18T17:14:05Z. The update package is 438.63 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: 3c2247a7aa11899a7bdcd3927af99d4b80d6b381.zip.