watchOS 5.2 (build 16T5212e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-03-04T18:11:25Z. The update package is 476.65 MB. This is a delta (partial) update that requires 5.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 64e5c1aabc4889c3c6cff59fd638ff795dccc34a.zip.