It does not contain an internal unpacker till now so you have to manage it and it may be getting one soon. The very first PSP was released in In the very first edition, it has a number of bugs which made it easy to get inside the software and run your own code on the PSP.
When a large community of hackers came to know about this then all these hackers came into the scene and they wrote their own software for the device. Just because if the efforts if all the unknown hackers now there are a lot of little homemade games to run on PSP. Now the very important thing you may look for is where to get all these homemade games. We have tried to find some forums and links from where you can get some information about the game. We have posted a collection of links here which can give some good information about it. PPSSPP in the very near future will have the feature to automatically download and install homebrew games. Now the last and very important thing is how to get all these games on your device.