Can some one help?

I just bought PSP, i upgradet my PSP to 3.03. And i downloaded some homebrew games from this site, but i can't get them to work. I go to PSP/GAME and my new folder for example "Wolfenstein3D". Then i move all the files into that folder and when i try to play game my PSP "says" That file is corrupted. Sorry being a dumb but what should i do? All the offical game demos do work for my PSP.

There is nothing you can do since you upgraded no homebrew works on a 3.03 firmware PSP

Ouh, okei. Thanks for that information.