I bought a Megasat box, hooked it up to the dish and TV and selected a satelite. It did a search for channels and found a bunch, but most say it is a scrambled or bad channel. The free channels (PPV ads, etc.) are working and signal strength is high. I got the autoroll for the unit from the supplier and flashed the ROM, but it still doesn't work. What am I doing wrong. The manual that came with the unit is terrible and there were no instructions with the software files.