watchOS 5.2 (build 16T5222a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-03-11T17:11:20Z. The update package is 180.19 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: 272b241288a620828ebfee8604bcbe352203d0b6.zip.