Do you have to have custom firmware on your psp to be able to play downloaded games?

I have downloaded a psp game which is either .iso but when i put it on my psp do i have to have custome firmware, and if i didnt and i put it on would it just not show or would it reck my psp or would it show but not play?

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Yes, you must have custom firmware on your psp in order to play downloaded psp games. For example...lets say you have a psp thats at 3.90. Then in order to know it has custom firmware then it would say 3.90 m33-3 or something like that. If you wanted to put custom firmware on a psp then you will need some kind of downgrading tool which is called a "Pandora Battery".
Now when you have a custom firmware psp then to properly get a downloaded psp game to work on it then you need to create a folder in the main root of the memory stick called "ISO". Then you are going to put the downloaded psp iso game in that folder and then thats it. Once you run the game, make sure you have a game disc inside and the system will be able recognize the downloaded game as a real game then the game will boot. Try it and you'll see what I mean.

Yep you need Custom firmware (CFW) to play iso. files on you psp.
If youre interested in putting CFW on your psp, this tutorial tells you how to make a pandora battery and a magic memory stick in order to hack you psp. Putting CFW on your psp wouldn't wreck your psp as long as you follow the directions.
http://www.pspiso.com/showthread.php?t=1...
registration required for the site. after registering, go the the address i gave you above again