Found one : https://gbatemp.net/threads/the-ultimate-m3-perfect-gba-guide-final.336658/ xD
Thanks for the help, but i live in Brazil and the only flashcarts around here (supercard sd mini) costs like 38 euros.
Hi there guys, i bought a GBA SP and it came with an M3 NDS&GBA Movie Player (same as the picture), but i don't know how to use it, I think it uses an mini SD. Could someone give me a tut ?