I have problem in downloading the firmware from computer to receiver. I am using Cable RS232(female), I followed the wiring in accordance with the wiring diagram as I have found from the websites. . I Link PC to STB with RS-232 Cable(female), but when I’m trying to download the file through the program, the “connection failed” message appeared. What should I do? How do I know if the connection in the computer is correct? Do I have to configure the setting of COM port? Thanks.