watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-09T17:08:05Z. The update package is 344.75 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: 80912b84e2625135484881ed98ff7fe36b59caea.zip.