I have searched the internet far and wide, and I have not managed to find any explanation about what a "homebrew" PSP is. The only thing I saw in reference to it is someone saying "if you have to ask what it is, you probably don't have it." Well, that's fine, but I assume there is some way to get one other than being predestined for it.
I just want to play old PC games on my PSP. I got Duke Nukem, for example, and that worked up to the point where my PSP said "unable to play the game" or something like that, which I am told is because of a firmware upgrade. I need to downgrade it to play the games I want to play, and my searches showed that the best way to do it is by something called Pandora's Battery. I found instructions for how to do that, but again, they say I need a homebrew PSP. My question is: how the heck do I get one?