I just got this error an tried everything to fix it. I finally opened it up and discovered that the SD reader board cable was not fully seated. snapped it back in and stuck a new piece of foam on top and everything is working perfectly again.
I sold my 3DS.
I have a nearly brand new R4I 3DS Gold Deluxe for sale. Still have the package. Only used it for a few weeks.
I can't sell it on ebay or amazon.
Anybody want to buy it or point me in the right direction to sell a used flashcart?
Offers?