go here: http://www.dcemu.co.uk/vbulletin/showthread.php?t=25452
you'll see this in someone's post.
Is it true?This game is great. I played through the first 2 tutorials so far. Really well executed game. Nice and polished. It only required 2.60 firmware. Not 2.70 like previously speculated.
What's best for us 1.50 users is that this game can be loaded on 1.50 PSP's. You need to download and drop a savegame into your PSP's memory stick to get the game started for the first time. Then you can create your own profile and overwrite the one you placed to get the game loaded.
I recommend this game to most any PSP owner.