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 47.88 MB. This is a delta (partial) update that requires 5.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 892db69a9887547c2016fd6768779647cf05d4b7.zip.