why are ppl downgrading there psp and how do you know which version u have?

Answer 1

They are downgrading to put Homebrew games and apps on the PSP. But you have to be careful because you can Brick your PSP if you don't do it right, that means turning yoru PSP into a useless piece of plastic.

For free flash games for PSP you can check out http://www.psponme.com

For free videso for PSP you can check out http://www.guba.com