watchOS 5.3.8 (build 16U680) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2020-07-15T17:28:16Z. The update package is 67.59 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: 3e184287d3e645e0e941b648704a2ba96e60e72b.zip.