watchOS 5.3.4 (build 16U627) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-12-10T18:22:28Z. The update package is 58.69 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: fa0d3679c5db0e94453bca780e6de38788f59c44.zip.