watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-09T17:08:04Z. The update package is 679.07 MB. This is a delta (partial) update that requires 3.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 63e2916a8cb09bbe80baee178b90c26a0aed33ad.zip.