Need some help here. My Hikvision DS-7608N-E2 8P has gone into 15 beeps and then reboot itself after firmware upgrade. I can ping both 184.108.40.206 and 220.127.116.11 but I'm not able to see NVR taking the file. Is there a special cable to connect to the board, like a usb to pin? If so, you what type of cable is that? Thanks.