When i plug my RS232 to USB converter in to my pc then to the dm800hd se it does not show,it will show in other devices i tried but not with the Dreambox, I updated the software from openpli via the dm and it would not reboot ,so i falshed it with the secondstage dm 800se 84 nfi file still nothing rebooted and then have error no ca found trying to use Dreambox opti flasher but failing to ge the pc n dm together . Any advice???