Hacking Kirby Super Stars Ultra : invalid MS DOS function

[lucifershalo]

Hello I have a first generation Ds
I use a Supercard SD (SD TO GBA) with a Superpass DS
my supercard program is version 2.68
firmware 1.85
I patch the rom (n 2696)
then I put the 2 files from my HD to my SD card and it says "invalid ms dos function"

any help would be appreciated

thanks