How do I downgrade a 3.72 FAT PSP

I have 2 memory sticks, a 512 and the 32mb that comes with it.
Can anyone tell me how to do this?
Answer #1
TRy this: http://forums.maxconsole.net/showthread.php?t=80949
and http://www.youtube.com/watch?v=ynTikZFJ_rE
Answer #2
Buy Pandora’s Battery
Answer #3
Buy Pandora's Battery
Yes indeed