I have to choose supercard dsonei because of the usb wirter (my DSi has 1.4 firmare installed already), but I kinda like Acekard 2i better, so Can I flash AK2i with Supercard usb writer?

 

If you have the USB connector (it's not a writer, it just gives power to it, and the Super Card automatically runs the update file on it's Micro SD) you're obviously going to also have the Super Card, so why is there a need to flash the Acekard?

 

Of course it won't work, How does the SC writer know to boot up the update file on the acekard. Common sense Anyways just find a friends DS or someones DS and update the card. You can also pay gamebygame $10 to update your acekard for you. click here