Homebrew is kinda old and it is wierd you haven't heard of it. The only way to get it is downgrade to 1.5 then to 3.XX OE-A or M33(OE-A and M33 is custom firmware) The only way to get it is to downgrade is to use a exploit in a firmware or through Pandora's Battery which is a downgrader for any firmware.I could help you downgrade if you would post your firmware in this thread. Once on custom firmware, you can download games in .iso form, but it is illegall, you can also play homebrew games people have made, and have custom backgrounds, icons, gameboots(the video that comes up when clicking the UMD icon on the PSP).