watchOS 5.3.2 (build 16U611) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-09-26T17:09:33Z. The update package is 834.39 MB. This is a delta (partial) update that requires 4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 540cae4cc1487599e9f7751177e5ee8b55cb7f52.zip.