If it’s there, congratulations you have found the problem! It’s the wrong driver.Go to Device Manager and see if you can find “ Guillemot STM DFU Device” under any Device Type, e.g.Put your FC in bootloader mode (aka DFU mode, to do this, power off the FC first by unpluging USB cable and LiPo, hold down the boot button on the FC, then plug in the USB cable).The correct DFU driver should be “ STM32 BOOTLOADER“. If you can connect to the flight controller, but unable to flash firmware and it gives you the “Failed to open serial port” error even after running the ImpulseRC driver fixer, it’s possible that you have a wrong DFU driver installed e.g. Once that’s completed successfully, fire up Betaflight Configurator and try to connect to or flash your flight controller and it should work. This tool will automatically search for your FC, and install whatever driver you need on your computer.Download and run ImpulseRC Driver Fixer Tool here (Warning: it’s a 3rd party software, please scan it with AV software before running it).Connect your FC to the computer via USB Cable.If that didn’t work, try running the ImpulseRC Driver Fixer. This is perhaps the most common issue when connecting to or flashing a flight controller in Betaflight Configurator.įirst thing to try would be a different USB cable, make sure it’s a data cable, not a charging-only cable.
