Start up Zadig and select “STM32 BOOTLOADER” and click install driver. ![]() There should be no blinking lights if the device entered the bootloader mode sucessfully (permanent on is ok). Next, boot your STM32F3 board into the bootloader mode by shorting the BOOT pin before connecting any battery or USB cable. Visit the Zadig website and download the appropriate version for your machine. Thankfully there is a nice toolchain called Zadig that installs this driver for you. Therefore the first steps involve installing WinUSB. First of all dfu-util uses the WinUSB library to talk to the USB device. In order to install dfu-util on windows some requirements have to be satisfied. It is available for Windows, Linux, and Mac machines.Īs the tool runs on Windows and Linux, i wrote down instructions for both operating systems, scroll down for the Linux version □ Installing dfu-util on Windows One of these programs is called dfu-util. In order to flash those boards one needs a special tool that talks to the DFU bootloader using special USB commands. This DFU bootloader resides in the ROM of the STM32 core and is not erasable, so this bootloader is un-brickable (yay!). All STM32F3 based flight controller boards and various other hardware using a STM32F3 CPU can be upgraded using the DFU protocol over an USB connection.
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