watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-03-18T17:13:49Z. The update package is 438.66 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: 25450faf9b29e266070cbd2f1fa2fb495649dd4d.zip.