If your computer lacks a native serial port, you will need a reliable USB-to-RS232 driver.
If using a USB-to-Serial adapter, there may be a driver conflict. Try uninstalling and reinstalling the latest drivers for your USB-to-RS232 chip (like PL2303 or CH340). 3. Receiver won't boot after the upgrade. ali-rs232-upgrade-tool-v1-2-0 downloader
