watchOS 5.3 (build 16U5545c) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-06-11T17:13:14Z. The update package is 453.62 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9cdd45db061aa54f655f1526d22eb42d5ca2bf7b.zip.