watchOS 4.3.2 (build 15U5053b) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-05-30T17:06:45Z. The update package is 368.71 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: bfe32b287f951c4596bb276bd417f3c26528c020.zip.