M3 Ds Simply Problem!

Whatever firmware I install new or old non works please help me
Any new game I install It comes white screen Ialready tried formatting
and copying file again at least 5 times but it wont work at all

Format your microSD with the Panasonic SDFormatter, then make sure you are putting on the correct firmware.If this still fails, try a different microSD card, and if that fails then probably your flashcart needs replacing.