watchOS 5.3.9 (build 16U693) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2020-11-05T18:19:33Z. The update package is 27.93 MB. This is a delta (partial) update that requires 5.3.8 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: dd822d675c5cd583484de9f3accc212fe0a0b7e1.zip.