M3 DS Simply v1.07

i have a question i was hoping someone on here could help we with. i just got m3 simply (works awesome), but i used to use the g6 lite with a passcard (hated it). but when i used that i got sick of needing the passcard so i did the whole flashme thing to make it auto boot from the g6 cartridge w/o the passcard. neway, since m3 simply cant play gba games i wanted to use my old g6 lite for my gba needs. problem is that when they are both in the ds it autoboots to the g6 lite instead of the m3. anyone know of a way to fix this. i realize this is a rough explanation, so if i need to clarify anything just say so. thx