Unlike cartridge-based consoles (like the NES or Genesis), many disc-based systems require copyrighted BIOS files to function. This post explains exactly where to put them on your Vita.
Once you've added the files, open RetroArch on your Vita and go to Settings > Core > Manage Cores . Select a core (like PCSX Rearmed) to see if it says "Present" next to the required BIOS files. bios files for retroarch ps vita
On the PS Vita, the default directory for all BIOS files is: ux0:data/retroarch/system Unlike cartridge-based consoles (like the NES or Genesis),