Create a downgrade that tricks PSP into believing it is a higher version.
IE: downgrade 1.51 to 1.5 by calling the downgrade 1.511.
Produce the signed code by making a program that displays the dynamic code on the psp screen as it is randomly generated.
(random alphanumeric generator that displays correct digits on the psp screen) a' la that seen in matrix at the end of the first one.
I've got more but thats all I can remember right now, I'm beat.