Launch the ISO loader, select the The Sims 4 ISO file, and follow the on-screen instructions to start the game.
Ensure your PSP has a custom firmware (CFW) installed. If not, research how to install a CFW on your PSP model. Sims 4 Psp Iso
If you're still interested in playing The Sims 4 on PSP, make sure to take necessary precautions, such as using a reliable source for the ISO file and having a backup plan in case something goes wrong. Launch the ISO loader, select the The Sims