Originally Posted by iowabowtech
Most generally that is because the card is not formatted to FAT32 or you did format it to FAT32 and it didn't take the format well. Have you tried the .exe RUU method listed in the OP? It may be a better option for you.
oops, ninja'd by sdrawkcab
i formatted it twice on 2 different sdcards and nothing. i tried the ruu but it fails cause of something not being compatible