I've read all the guides. I have iTunes 7.7.1, and I've gone through all the steps with the IPSW file. I've also done the whole hold down power and home button things and I can get my iPod to go to DFU mode. After building the IPSW with winpwn, instead of saying it's done it just shuts the program down, and the created file is just 24MB big. What am I doing wrong?