Yes, i did it. and i works. but now, not !
look, i can boot mac from USBThumb , (which i installed with that before) , but now chameleon tells ( can't find mach_kernel ) when booting from H.D.D actually .!
So i only could boot mac from USB with 'Safe Boot' but now, i cannot even boot from USB !
what did i do, what can i do ?! I'm Confused !