watchOS 5.3.3 (build 16U620) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2019-10-29T17:09:34Z. The update package is 69.87 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: 6fd246b28189eac62e40c6f2f602068ab62acdc6.zip.