r4 not working

ok...i downloaded games onit like it said now i put the r4 in ds bottom screen is white top screen is white and says menu ?.........what have i done wrong

Care to go into more depth?
Try this:
https://www.romulation.org/forum/index.php?topic=1462.0

You need firmware (system files).

all fixed...... thank you......wow i looooove it......hahaha