watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-03-18T17:13:59Z. 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: d43e917229359afe779169ff8bc896b2690abb85.zip.