watchOS 5.2 (build 16T5181f) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-01-24T18:08:36Z. The update package is 420.82 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: a692a282064674195c6c6dc54b2577843d9a7b0e.zip.