watchOS 5.3.8 (build 16U680) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2020-07-15T17:28:35Z. The update package is 1.3 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 487dabb5547685412cae936ab4f0724af931050a.zip.