I have attached the HP format Tool for you.... even with using this a Vu box can be very picky regards the make of usb stick used to flash it...
Can you just confirm it is a Vu Duo 2 you have not the Duo??? this is what you have said your using in your last post, it's just it can be fatal for your box if you flash the wrong image...
master G hast the FTP password set as linuxsat and the username should be root, but if you have already tried that and it's not working then try the password as vuplus.... using the same username.