watchOS 5.3.6 (build 16U662) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2020-03-24T17:21:31Z. The update package is 46.3 MB. This is a delta (partial) update that requires 5.3.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c7d56a9310d60d778e0f21bda9cab19a4d305461.zip.