i am trying to re-flash DM 500 hd , i know how to do it but when i press and hold switch on the front and flick switch on the back , i dont get an ip address appearing on the tv , how ever long i hold the switch . then i just get the green light keep flashing numerous times and nothing happens until i press the switch on the front again and box comes on as normal but still has the same image on . can someone help with this ? thanks