If someone needs a downgrade,i've got always a Pandorized Battery+MS Sandisk 256 Mb...
If you have a TA-082/086 PSP MoBo,for making the Downgrade,you have to make a corruption to some of the keys...Pandora will automatically repair these keys by using the idStorage(i don't mean id Software)...I've downgraded 5 PSPs with a TA 082/086,and 2 of these are White PSPs,3 of these are 3 Black PSPs....
For the Gamepark...well,if you have a CF,you can convert your PSX Games,and have a lot of fun with them...At the moment,the Top Games of the PSP are:
1)Silent Hill Origins,2)Monster Hunter Freedom 2nd,3)LocoRoco(for the happiness of Rome.ro

),4)D&D Tactics,5)Metal Gear:"Portable Ops",6)GTA Vice City Stories,7)Killzone:Liberation
These are my preferred games,and are the best games of the PSP....