How do I play SNES and NES games on PSP?

You will need custom firmware for that. I don’t know much about custom firmware.

Here

You should be aware that playing ROMs you don’t own is probably illegal in your country.

More than likely the same goes for other countries as well.

i think you need the older psp model or something cuz i heard that newer ones have updated firmware so you can’t play emulators on newer ones or updated ones… my friends are really into it and use something that lets them get japanese games for free but i dont know what its called exactly….