watchOS 5.3.7 (build 16U674) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2020-05-18T17:31:48Z. The update package is 73.31 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: b0301c42d4a60a0070f7dc77dd27e3d26e62c5d0.zip.