I need help with downloading games in my PSP! Help me please... it's urgent!

Sorry to bother you, but it's my first time. I downloaded an ISO game from this site onto my computer but, when i transfer it to my PSP the game won't show up in my memory stick in the game section. Why not?by the way, my PSP is in version 3.71please help!

you cannot play downloaded PSP games on the official Sony firmware, you need to downgrade to a custom firmware.

how do you downgrade to a custom firmware?

With a pandora battery. Try the link
https://www.romulation.org/forum/index.php/topic,8507.0.html

what version do i need and my PSP is colored white and i can't put in a pandora batterywhat do i do now?

You dont put in a pandora battery, you modify your battery so it becomes a pandora battery. Or if you dont want to go through the trouble, you can purchase a pandora battery online