watchOS 5.3.8 (build 16U680) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-07-15T17:28:23Z. The update package is 58.49 MB. This is a delta (partial) update that requires 5.3.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d2f5048cc3786d3a233dfb9ebf06f4ea3e33e83a.zip.