watchOS 5.2.1 (build 16U5101c) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-04-22T17:13:12Z. The update package is 137.63 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: 43a3111cb5d5d02ac59ec97f5516565d428b68ac.zip.