watchOS 5.3.7 (build 16U674) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2020-05-18T17:32:00Z. The update package is 49.41 MB. This is a delta (partial) update that requires 5.3.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a30fe4f5eaface4d653103241aa3296eb85ff602.zip.