Ensure you have the latest BlackBerry USB Drivers installed on your Windows PC.
An autoloader is a standalone executable file ( .exe ) that contains the entire factory-fresh OS for a specific BlackBerry model. When run, it bypasses standard desktop software to "force" the installation of the firmware directly onto the device's hardware. blackberry 9800 autoloader
Back up your device using BlackBerry Desktop Software if possible, as this process will wipe all data . Ensure you have the latest BlackBerry USB Drivers