I've just downloaded the next file: PSP.Game.MonsterHunterFreedom2.English.UMDFULL.ISO655MB.ByC_M and I've tryed the passwords from 0001 to 9999 with a brute force program (thx to angeal who post about the pass cracker dictionary) with no success. Also I've tryed both passwords from this post.
The file also came with a txt file who redirect me to this address (password in
http://www.fantastico.cl/c13/viewtopic.php?t=311) but this page no longer exists...
Hope you can help me...

in advance.
Its not the 2g version but the normal one...