watchOS 5.2 (build 16T5181f) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-01-24T18:08:21Z. The update package is 399.35 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: 9d97f485428d469288c4e9f35eb2cc5c0f977140.zip.