THIS SOFTWARE COMES WITHOUT ANY WARRANTY!

Mostly GPLv2. Only some Include-Files from STMicroelectronics use a different license which can be found on the top of every affected source file.

You need "IAR Embedded Workbench for ARM" for building the sources.

This is not possible, except you have the encryption key for the modified dfu boot loader.

• Install "DfuSe Demonstrator"
• Press the button with a paper clip while connecting to USB port
• Flash new Firmware with "DfuSe Demonstrator"

• Install dfu-util (>= 0.8)
• Press the button with a paper clip while connecting to USB port
• Flash new firmware as root

    dfu-util -d 0483:df11 -a 0 -D usb2can_1_5.dfu

• Optional a new serial number can be flashed

    dfu-util -d 0483:df11 -a 1 -D E000xxx_1_0.dfu

Sometimes an USB hub helps. This is not a firmware issue, so it will never get fixed.

This happens when a powered USB hub is used and the connection between the host and hub get lost. This is a firmware issue.