watchOS 5.3.2 (build 16U611) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-09-26T17:09:47Z. The update package is 484.03 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c6abfbf44470295bfa304972dec9adfe0fc7efd3.zip.