1- First, download the BT3 USB iso
download:http://www.remote-exploit.org/cgi-bin/fileget?version=bt3-usb
2- Format your usb drive to fat32
3- Install an iso mounter (u can use DAEMON TOOLS)
download:http://www.daemon-tools.cc/downloads
3- copy both folders to your USB Stick
4- and run Makeboot.bat (boot folder)