watchOS 5.3.4 (build 16U627) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-12-10T18:22:19Z. The update package is 51.65 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: 325539d3d66c34d56d55f93a91749ce37116a099.zip.