@siod would be interesting to see if doing this step is needed. I’ve always done that but hey, who knows. Maybe you can try without first 
Regarding your step-by-step list:
- Install HM-MOD-RPI-PCB on your RPi2
- Flash and boot openHABian: http://docs.openhab.org/installation/openhabian.html
- Connect via SSH, enter
sudo openhabian-config, execute the Homegear and Serial Port menu entries - Continue in Paper UI