Homebrew applications are programs (such as games and emulators for old game systems) that are written by individual programmers and usually distributed for free to anyone who wants them. The firmware version will be displayed on your screen. Select the "System Information" option.In order to play downloaded games (ISOs) you will need to "hack" your PSP, this process is explained below but first you need to know which firmware you have: The firmware is the operating system that your PSP uses to store files and execute functions. Find out what firmware you have installed.Your PSP device will then format the memory stick (it should only take a few seconds). Confirm your action by choosing "Yes" in the menu that appears.
Select the "Format Memory Stick" option.Use the cursor buttons to go to "Settings" and then go to the "System Settings" menu.Press the PSP "Home" button at the bottom-left of your PSP (it has a the PlayStation logo).Find and remove the lid on the left side of your PSP and insert the MS facing up.Format your PSP memory stick using the following steps.Make sure you get a large stick you can have more games at the same time. The memory Stick supported by the PSP is the PRO-DUO, but you can also use Micro SD cards with PRO-DUO adaptors. PSP games come on small discs called UMD (Universal Media Disc), the games you will download are images of this discs called ISOs so you will need a Memory Stick (MS) to store this games.