Download No$gba2.4 and three files Biosnds7.rom Biosnds9.rom(not necessary but it's better to have it) and firmware.bin plus these the EndryptS Advanced.exe and place these files in the same directory. Also place in the same directory the rom files. Open EndryptS Advanced and choose option 1 from your keyboard , it will encrypt the rom files you have and when you will load a nds rom in No$gba2.4 it will run.
I tried these roms
Castlevania: Dawn of sorrow (stopes at name screen)
Castlevania: Portrait of ruin (couldn't be saved)
Kirby Kanvas Curse (worked perfectly )
Emulator was working all time with full speed