If you're one of the lucky people with an NTFS file system and think you're going to use a symbolic link to move your IPSW to your dfesktop, DON'T! Use a HARD LINK, IF YOU MUST USE LINKS AT ALL!!!! I learned the hard way that this will screw up your device! Since a symbolic link is basically the same as a .lnk shortcut, you're telling redsn0w that this shortcut file is your firmware. Since it's a symbolic link, redsn0w will read the ipsw it's pointing to all fine and dandy, butit will patch the shortcut and upload that to your device! If you have succeeded in doing this, all you have to do is re-jailbreak, but with a HARD LINK OR ORIGINAL FILE.