watchOS 5.2 (build 16T5222a) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-03-11T17:11:52Z. The update package is 476.24 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: f2471934f49fc879021f28c925cd8b6ec2b7aa4c.zip.