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 44.7 MB. This is a delta (partial) update that requires 5.3.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ee5bd49c260df64ff903ba77657c41b84e1b88d9.zip.