how to reinstall Ubilinux from bootable USB ?

bruce New Member Posts: 15
Hi, guys. I really need your help, everything is messed up with my UP board.
My system is booting in Command line and I am not able to run certain commands wich includes the webcam operations. So, I just want to reinstall/reset my UPboard and want to install fresh copy of the Ubilinux, how to do that using bootable USB ??

please help, it's an emergency. Thanks