EZFlash V will not load

When I start my NDS and choose the EZflash drive on the NDS main screen(where is shows the time and date), it goes blank (white screen). any thoughts? I tried to update it but thats no good. The microSD is fine because I tried on another NDS with another EZFlash and it worked. Is there a way to reset the EZFlash? or do I have to buy another one?

Try reinstalling the firmware.

I did that and I even held the R button when it starts, just to update, but still no good. I still get a blank(white) screen.