usb not found

[robertalrp]

Hi,

I have plop boot manager running properly but, when I have to choose the device I want to boot from, by selecting "usb" I get an error message because usb device is not found.

My usb device is a mp3 player connected through usb cable with a distro linux live ISO (I checked the m5sum before and it is correct).

Help me, please!