watchOS 5.3.6 (build 16U662) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-03-24T17:21:22Z. The update package is 70.08 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9583cf24bf68668cae31baea38739b1e2d328cfa.zip.