watchOS 5.3 (build 16U5545c) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-06-11T17:13:15Z. The update package is 140.39 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cb219925b29a91a592632ae73f2de7506467df5e.zip.