Hi, Problem solved! You need to use micro-usb port instead of the mini-usb port to flash the micro-controller chip STM32F407VG on the STM32F4DISCOVERY board. The mini-usb port is connected to the STLINK chip STM32F103C8T6 on STM32F4DISCOVERY board. I wanted to flash the STM32F407VG chip on STM32F4DISCOVERY board. If I am wrongs or could it be flashed using mini-usb port please share it with me for my knowledge. I am using this link for assistance: https://github.com/micropython/micropython/wiki/Board-STM32F407-Discovery On Fri, Jul 18, 2014 at 5:21 PM, Asif Sardar < engr.asif.sardar@xxxxxxxxxxxxxx> wrote: > Hi, > > I am downloading the firmware elua to the stm32f407vg on stm32f4discovery > board. If I use st-flash (STLINKv2) it works fine for flashing, but the > dfu-util doesn't work for me (it says no capable DFU device found), even if > BOOT0 is connected to VDD and board reset. > > Other then that, I am not able to get terminal emulator working with usb > port, such as minicom over /dev/ttyUSB0. I also tried to connect the > relevant USB pins to the serial UART port on the board, still not working. > Which serial port are you using over the discovery board for minicom? > > I remember you had some problem with USB to serial connection also. Can > you please help regarding this issue? > > -- > > > > *With Best Regards,Asif Sardar.+358 43 8265795 <%2B358%2043%208265795> * > -- *With Best Regards,Asif Sardar.+358 43 8265795*