watchOS 5.2 (build 16T5222a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-03-11T17:11:06Z. The update package is 150.42 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 28675ef95b6e830b98c7c305f4ead4a32db713c2.zip.