watchOS 5.2 (build 16T5222a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-03-11T17:11:11Z. The update package is 439.32 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0960572340c785899542ba21123eb23d3f619e00.zip.