My iPhone is already jailbroken on 2.2. I'm trying to go to 2.2.1 iPhone software and have downloaded pwnage 2.2.5 and created my custome restore .ipsw file on my desktop. I connect my iPhone to my computer and put the phone in recovery mode. I hold the option key when I click the restore button in iTunes and then select the .ipsw file I created in pwnage (using simple mode). I keep getting the error message that the iPhone could not be restored and an unknown error occurred (1600). Any idea what gives?