Can not boot tethered on 4.4.2???

Hi all!. I bought a new in seal ATV2 with version 4.4.2, I use Ifaith, seaonpass and Total commander to itunes to completed Jailbreak. I used seaonpass to boot tethered, it is not going to DFU mode, what wrong is it?. Thank for all your help.

Finally, I changed to another comp. It’s worked prefect. Thanks all