Doesn't know about Viper, but I have the same problem with SuperSu on Redmi 2 Prime. Successfully installed via recovery but not works at boot, when I'm installing it from local apk or PlayStore it says "no su binary installed".
Sir, can I request custom BBM app icon? If you're busy can I help making it for you?
So it will be available in the next rom update. If yes, where I can send it to you?