I have a psp slim with 3.60 firmware, can I put 3.71 m33-4 cfw on it without bricking it? I have a psp fat with 3.71 m33-4 on it. I also have a pandora batt and magic memory stick, can I use that to downgrade it? Sorry, I searched around the forums, but i am confused about getting the cfw on it. It is 3.60, not 3.60 m33. Is there a difference? This is where I get confused. Thanks in advance! I am sorry for being a stupid noob, I just dont want to ruin my son's new psp. I would be in the dog house, not good. My older son has the psp fat, and they fight over the games on it. So I figure it would be worth a shot to downgrade his slim. Thanks again!