Download the latest M3Real system files (see main page on this site, gbatemp.net, for a link). As of this reply, the latest version is v2.9, released within the past day.
-If you haven't already, format your memory card FAT32 on your PC and insert into the M3 Real.
-Create a folder by the name of SYSTEM on the root of your memory card.
-Unzip and copy the latest M3 Real system files into that SYSTEM folder on the memory card.
-Boot your DS with the M3 Real Card.
Hope it helps!