watchOS 5.3.8 (build 16U680) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2020-07-15T17:28:11Z. The update package is 36.93 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: f2ff9b92e62fd2e8401a187e0152039cb488daf8.zip.