watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-03-18T17:13:40Z. The update package is 470.5 MB. This is a delta (partial) update that requires 5.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 18ad9c3bc5de8a68e732a2829c124709f8778b6b.zip.