watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-07-09T17:08:08Z. The update package is 696.02 MB. This is a delta (partial) update that requires 3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 459579f8542a878e7fc7e67b64fa4a52c4729c32.zip.