why not just flash via your microsd card? Just rename the RUU_signed.nbh file to RAPHIMG.nbh and place on the root of your card, then press and hold VOL DOWN + Power and while holding that, hit the reset. You'll get a prompt to press the power button, then the process will begin.
FYI - The file name needs to be RAPHIMG, some people have trouble because they name it RAPHIMG.nbh.nbh, that doesn't work.
