They also are giving misleading FAQ section on the situation
Q: I updated the firmware on my StageScape M20d, and now the StageScape App won't work?
A: The firmware on your StageScape M20d and the StageScape App must be the same version. So if you updated the firmware on your mixer, be sure to download the updated App from the Apple App store."
I would think this alone would makes them liable if nothing else