I read the all you need to know PSP guide. I have some questions: 1. What is the highest firmware or version the PSP can be and still get downgraded? 2. What is the firmware or version of PSP's being sold as of now? 3. Is there a program called DEVO that lets you have 1.5, but also lets you have the features of the highest firmware? 4. What is the safest way to make sure you are buying a PSP that can be downgraded?