How can I install Viper?

I've successfully rooted and installed TWRP, but I can't install Viper, no matter which method I use; either flashing a zip or using the APK. Busybox is installed and tests ok, as does SuperSu. Has anyone successfully installed Viper on the M4? It seems to be the driver that doesn't install properly. On a couole of attempts it states the driver has installed, yet it does nothing, or gives an I/O error.

Any help would be much appreciated. I'm using a 2303 on 3.111 firmware.

Cheers!

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