USB Flashing

Some newer boards with full USB support must be flashed in USB DFU mode. This is a straightforward process in Configurator versions 0.67 and newer. The standard flashing procedure should work successfully with the caveat of some platform specific problems as noted below. The “No reboot sequence” checkbox has no effect as the device will automatically be detected when already in bootloader mode (a DFU device will appear in the connect dropdown if this is the case). The Full chip erase checkbox operates as normal. The baudrate checkbox is ignored as it has no relevance to USB.

Platform Specific: Linux

Linux requires udev rules to allow write access to USB devices for users. An example shell command to acheive this on Ubuntu is shown here:

(echo '# DFU (Internal bootloader for STM32 MCUs)'
 echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE="0664", GROUP="plugdev"') | sudo tee /etc/udev/rules.d/45-stdfu-permissions.rules > /dev/null

This assigns the device to the plugdev group(a standard group in Ubuntu). To check that your account is in the plugdev group type groups in the shell and ensure plugdev is listed. If not you can add yourself as shown (replacing <username> with your username):

sudo usermod -a -G plugdev <username>

Platform Specific: Windows

Chrome can have problems accessing USB devices on Windows. A driver should be automatically installed by Windows for the ST Device in DFU Mode but this doesn’t always allow access for Chrome. The solution is to replace the ST driver with a libusb driver. The easiest way to do that is to download Zadig.
With the board connected and in bootloader mode (reset it by sending the character R via serial, or simply attempt to flash it with the correct serial port selected in Configurator):

  • Open Zadig
  • Choose Options > List All Devices
  • Select STM32 BOOTLOADER in the device list
  • Choose WinUSB (v6.x.x.x) in the right hand box
    Zadig Driver Procedure
  • Click Replace Driver
  • Restart Chrome (make sure it is completely closed, logout and login if unsure)
  • Now the DFU device should be seen by Configurator


  1. Any Mac instructions lying around? I am having trouble getting firmware to flash on an RMDO on my macbook pro. I have the configurator and firmware downloaded for the rmdo, I have followed the instruction on flashing new firmware, but when I load the file local and then press flash firmware I get this error ‘no response from bootloader, programming failed’ Is there something else that I need to have downloaded to make this work?



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