might be some problem with the exploit. try to format the 3DS entirely (remove the SD card if you don't want it to be formatted too).
afterwards install the exploit again with the blue card. it might help hopefully
@FlareReZ If I knew programming I would use the San Andreas source code to transfer GTA III and Vice City to the San Andreas engineI would port it to Dreamcast, Gamecube, Wii, DS, New 3DsI would recreate GTA IV and V usign the San andreas Engine