watchOS 4.3.2 (build 15U5053b) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-05-30T17:06:38Z. The update package is 333.24 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ba21b0d92122bb0bdf142860bcd809cbf48a04db.zip.