bkifft , my 3ds have this chip KLM2G1DEHE-B101 bundled in it and my 3dsxl has the toshiba THGBM4G3P1HBAIR , both chips are 2gb , if you don't believe me , i can post picsof both boards , and maybe that explains why some people got success with erasing their mmc while others can't
I doubt this is the reason. Again, there are not properly documented successful recoveries with the Arduino (one 3ds fell and broke before reflashing and the other is some french dude who preffers to keep his methods secret to profit with them).
I wish someone could confirm for a fact that it works besides the SD cards tests.