watchOS 5.2 (build 16T5181f) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-01-24T18:07:56Z. The update package is 467 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f2ffeb16ede6a0b0360728b0fab7a1c9fdd7769f.zip.