Recently got a 3.71 Slim PSP and wanted to put CFW 3.71 M33 on it. Made the battery and magic memory stick with my fat PSP and everything went fine. When installing on the slim, it said it had been successful. I pressed X to shutdown, then ever since when trying to start up the PSP I get the Sony intro, then shortly after it is about to load the XMB it freezes then eventually shuts itself down. I tryed installing on fat PSP and it does exactly the same. On the install menu I tryed to revert back to 3.71 but it does the same. Any ideas??