Okay so im more off a psp guy i no all about those. I recently bought a DSi and i want to get into messing around with this thing. Now im a bit confuse does the DSi work like a psp and goes by firmware ( downgrade to OFW -> upgrade to CFW ? ) if it works the same as psp can some one give me some firmware links. and also I looked around these forums and heard something about a R4 and acerkard card? what are they used for and can someone link me to a tutorial. thanks!