jailbroken ipod bricked help please?

so i boguht an ipod touch gen 4, but the previous owner had it jailbroken. i didn't really care for the jailbreak so i figured i would go back to boring old IOS and tried to update my firmware. well it tried and failed to update and now it won't go into anything other than recovery mode. i tried restoring and it won't work. i downloaded the firmware and tried restoring using that, still didn't work, tried using tiny umbrella, it did nothing. now i can't even seem to get it into DFU mode and nothing is working at all. please help.