watchOS 4.3.1 (build 15T5565a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-05-07T17:23:45Z. The update package is 95.92 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 61515aedf8810b8533d026c0a159da21a4eb1fab.zip.