I am planning to buy a PSP and I wanted to play backups on it. 1) Does the model PSP matter when buying it. Does newer models make it more difficult and older easier? 2) What software/hardware do I need for new/old models? 3) How can I tell what model it is if im buying from a online site like amazon, I read in some reviews the model number are not correct on the site with what they gotten. 4) Is there a tutorial showing how to do this? Thanks for your time.