Ok...Ive searched and searched but could not find any specific answers. I have a FAT PSP with official sony firmware 5.03. I want to downgrade it straight to 3.71m33. I already have a fat pandora battery. I also have a magic memory stick with 3.71m33 on it but i used that for my slim psp and im not sure if i need to download a different version for FAT. Is it possible to to downgrade from OFW 5.03 straight to CFW 3.71m33? And if so, how? ANY help would be GREATLY appreciated.