But one thing isn't ok: I can't access the web interface, I ran nmap and it said that no port is open. My workaround is simple and not really comfortable: I take the SD card and alter the SQLite databese with the configuration (Note: the database design is very very poor, has anybody else looked into it and saw how the cgminer configuration is saved?).
Did you determine where the cgminer configuration was saved?
~nh
It is saved in a SQLite database /mineros/mineros.db if this File doesn't exists it is created using the .sql File in the same folder. Look into the boot.py into the start_cgminer function to see how the data from the database is used. If you want to use your own configuration for cgminer you can simply alter the startup function in the boot.py .