sudo usermod -a -G dialout
firmware:
create a file : 45-stdfu-permissions.rules
and fill with:
# DFU (Internal bootloader for STM32 MCUs)
SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE="0664", GROUP="plugdev"
then:
sudo cp 45-stdfu-permissions.rules /etc/udev/rules.d
sudo usermod -a -G plugdev <username>