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 983.63 MB. This is a delta (partial) update that requires 3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3596e18af9d4d03837453b500916fd861efd620b.zip.