FHEM: CUL Update
sudo apt-get install dfu-programmer
wget http://culfw.de/culfw-1.58.tar.gz
tar xfz culfw-1.58.tar.gz
cd CUL_VER_158/culfw/Devices/CUL
dfu-programmer atmega32u4 erase || true
dfu-programmer atmega32u4 flash CUL_V3.hex
dfu-programmer atmega32u4 start