watchOS 5.2 (build 16T5181f) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-01-24T18:07:58Z. The update package is 483.85 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: ee3a5103eb1c90988f4389954dfb9965618575b2.zip.