I had the same problem. Fortunately, I had purchased three systems. I did a receiver to receiver transfer to the unit I ruined by downloading new firmware to. This restored it to the original and enableing it to work again.
After several other attempts, I found that my problem was that I uploaded a "zipped" file to the receiver. After dowloading the new firmware from Fortec's web site, it must be "unzipped" before uploading it to the receiver.
Sadoun will not repair units altered by consumers. I would be willing to help you out and do the same to your unit I did for mine. No charge. Just pay the freight both ways. Respond to this post if you are interested.