PSP 6.20 downgrader. . . is there such a thing?

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I recently updated the firmware of my PSP to 6.20. Everything seems to be going well. Until, I realized I could not play games previously saved on my PSP. What gives? I figured it's just a compatibility issue. So, I'm thinking of downgrading my firmware. Unfortunately, I couldn't seem to find a downgrader for version 6.20. Do you guys have any idea how to solve my problem? I'm desperate! I don't know what to do.