psp gods eater burst cwcheat

hi
I`m having a problem with the game gods eater burst for the psp
I`ve bought the game so it`s a umd.
I have costum firmware 6.60 installed and cwcheats.
I found the codes with google and people say they should work.
BUT when I start the game press select and turn the cheats on,then resume the game my umd freezes and my psp turns off.
can anyone help me?

i also have the same problem..i use cfw 6.60 b10..the cwcheat work but when i on the cheat on the game it doesnt work..nothing happen, i tried with other game that i have and it work..but my game doesnt freeze,before this its work..i dont know whats wrong with it..