This method didn't work with me.
To get the YSmenu working I renamed the TTmenu.dat to .nds and deleted the r4dldi from TTmenu folder. I open TTDS in the R4 and then YSmenu.
Download this thread files and you'll get Mario & Luigi Bowser's, Assassin's Creed, Wario Ware DIY, Sonic and Sega All...