watchOS 5.3.6 (build 16U662) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-03-24T17:21:23Z. The update package is 54.76 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: 70b7e1cf43dc548f95f3fbc4e73e49c5c3b0de74.zip.