While I'm not able to share my image currently, hopefully this will help:

The GBA on RetroPie requires an additional BIOS file that does not come with the initial download. [Here is the file, gba_bin.bios, found on Google Drive.][1] 

Once downloaded, move the file to your Raspberry Pi. At this point, you must place the file into the correct directory:

    /opt/retropie/emulators/gpsp/raspberrypi

For instance, if you saved the file to a USB drive, you could copy the file over:

    sudo cp /media/usb0/gba_bin.bios /opt/retropie/emulators/gpsp/raspberrypi

As long as the ROMs and this file are now in the correct locations, you be able to play the GBA games after you reboot.

  [1]: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0ahUKEwj0qPHTtuHKAhVDVj4KHcUAAyoQFghCMAc&url=https%3A%2F%2Fdocs.google.com%2Fopen%3Fid%3D0B6pZyudLcTGLOUNzQXIxWUkwaEk&usg=AFQjCNHAweHAyGx9qMfAsSgQiXDmy20T7Q&bvm=bv.113370389,d.cWw%20%22The%20file,%20gba_bin.bios,%20found%20on%20Google%20Drive.