based on what i read the card was never flashed which is why its not working on the 3ds. if it worked once (you saw the old logo) but not again chances are you just have contact issues. you should read tk_saturn's guide. if you stuff to thick a bit of paper in there you can bend the slot-1 pins and cause contact issues for everything as well as break your slot-1 from ever reading a game card again. so be careful.
http://www.akaio.net/forum/viewtopic.php?f=8&t=790
exchanging doesn't mean you will get a working card. the 2i is a bad design. my original developed contact issues after a year of use. its just a matter of time before you have to use some paper.
realhotstuff was selling fake 2i cards for awhile. have you verified what you got is real? regardless, they are good with exchanges.
-another world