I am currently running 3.1.2 firmware on my 2g Itouch. Every time I go to downgrade by-- shift>restore>then click my IPSW 3.0 firmware it begins to extract the files, then I get a message that says "The Ipod "****" could not be restored. An unknown error occurred (20)." How do I fix this? I really want to downgrade to jailbreak it... Thanks in advance!