watchOS 5.3.7 (build 16U674) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-05-18T17:31:53Z. The update package is 54.94 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: 395ca0ede39303e3327899b336b8035e7c4708ee.zip.