ipod jailbreak problems

i jailbroke my itouch 4g ios 6.0.1 tethered and then converted it to untethered using evasi0n package but then going throught the list of packages i deleted a package which deleted cydia. i tried to put cydia.deb in the ipod didn't work, the terminal apt-get install cydia method - didn't work i tried to restore multiple times using diff. methods, no luck,


can sum1 help me