watchOS 5.3.8 (build 16U680) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2020-07-15T17:28:17Z. The update package is 59.98 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: f56b6fd0a9d15c0830a22a384f29b23c98e01fef.zip.