The problem with this emu is that it uses the original bios of game boy advance which is illegal to share. The smartest thing is to wait for the retroarch build that will work better than this because it is much more developed and does not use original bios.
I've already shown what I wanted that is not far from other emulators such as the morpheus that loads the roms from the USB.
Anyway, there are way to load GBA roms on PS4 and play them that work exactly the same because i'm using the same core and same build they used to do that port