Problem with pmp: game related
 

I recently bought a slide panel 5"tft pmp that states it can play nes, gba,gb,gbc,and sega mega drive game, it plays most, however I am having trouble with gameboy advance games. The player came with two gameboy advance games pre-installed and they play well well on the device. The ones that came on a disk wih it also play well. However when I put my own .gba rom games or any .gba rom games on it i get an error saying "file not support". To note it does read the file, i just get that error

This is my player it is apparenty made by Fujiyama tech Co. Ltd. Model number F-MP01

http://img.alibaba.com/photo/2418680...MP5_player.jpg