Whether or not there is a factory file, loading the current factory file using a serial connection (DB9 cable that cme with it) is always a good idea. Then you turn the power off and on. Install the latest BIN. Again, it is a good idea to install the latest BIN using cable. Later on, you can install using USB. Then you rescan. Many a time these days there is fluctuation in channels that are available, so it is a good idea to rescan. In some receivers, the rescan may not overwrite the channels list, so you should erase all channels and then rescan.