i think you have to update your baseband to 06.14.02. thats an ipad baseband!!!it can be found online!!!!whereas since you cannot get into DFU mode try the bhakte dai's method!!!!and to

gucchchor!!! yeah the baseband unlock was found more than two weeks ago and i think it's not possible to downgrade these days!!!!coz apple has stopped signing older versions!!i think only the versions below 05.13.02 can be downloaed by fuzzy app from cydia!!!! hope that helps