watchOS 4.3.1 (build 15T5567a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-05-14T17:14:18Z. The update package is 184.09 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 78d7a572ba92b9af7e0a286de44e2c26e7e79054.zip.