watchOS 5.2.1 (build 16U5079d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-03-28T17:11:26Z. The update package is 148.02 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eb25e523d48dfbc6dae05fc933cb57d1162e72a3.zip.