watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-03-18T17:15:40Z. The update package is 457.13 MB. This is a delta (partial) update that requires 5.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d983429ab4773282463038534e73cfaa4519b511.zip.