I got a used PSP 2001 which came modded and a few games on a card (all games work). Under system setting it says "Sytem Software 5.50 Prome-4" 1. Should I update this to a current version? Which one? 2. Are cheat codes available for PSP games played on a modded console? 3. M2 memory sticks/adapter are expensive. Is there anyway to use SDHC and an adapter in the memory slot? Thanks.