watchOS 5.3.7 (build 16U674) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2020-05-18T17:31:40Z. The update package is 44.16 MB. This is a delta (partial) update that requires 5.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c779c39888db8ad24a92ec0b4db2c20ca3f2798c.zip.