watchOS 5.3.2 (build 16U611) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-09-26T17:09:32Z. The update package is 854.47 MB. This is a delta (partial) update that requires 4.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2205b7731ee9376ab96805275ad2acd41e7808d7.zip.