really? the blue card in mine can display a icon and if i click the 3ds will say the error occurred.
its happened in my japanese N3DS 8.1 and AUS 3DS 6.3 system
just download the newest 2.7 firmware and there has a blue card firmware inside.
yeah i know this.
its just test if this blue card can work or not.
my n3ds is 8.1 aswell. i can see a sword icon but i cant not run it.
but at least i know my blue card is working
there is no way to test red card i think
but if u want to test ur blue card u can just download the firmware from their offical website and copy to ur tf card
if it's works the 3ds will display a sword icon on screen.