Default [Q] crown b900

its an a rk3066 / 9.7 inch / 1.6 MHZ dual core / 1 GB ram / 16 GB rom / dual camera
i have flashed it with genio cm 10.1 rom .
they said its for all rk3066 devices .. i have a black screen when boot.. no cwm , doenst recognize usb ,( just black screen )
This noob company cant offer a stock firmware for its devices .. i have searched alot on the internet but nothing
pls help