startrack 550D super plus upgrade problem..

WHEN I WANT TO UPGRADE SOFTWARE MY RECEIVER SHOWS ASH ON ITS DISPLAY. BUT ALL CHANNELS ARE WORKING FINE.

I DONE FACTORY DEFAULT BUT NO IMPROVMENT. ALSO CHECK MY CABLE WHICH IS FINE. NO TRANSFER OF DATA FROM PC TO RECEIVER AND ALSO RECEIVER TO PC.

i think there is no problem of flash. but i dont know whats the problem.
PLEASE HELP ME.