ok, does this sound right so far, first a make a .sav with the supercard conversion program from a gba game. then rename the .sav to the same as the nes rom. and put it in the same folder and the roms.
then, L+R and save state
next, L+R+Select+A and save to SD (have to have a .sav file there)
finally, Load save state whenever you wanna play
does that sound right?