Vasile,you can use Total Commander program to connect to your box.To be able to do that,you need to open it and choose option net-ftp connect-new connection-and then look at the picture i attached.
You can install cccam emulator from softcam server in your Opena ATV image(blue button and find softcam option).
When you install cccam restart box and you ll get cccam.cfg in /etc.
I upload cccam 2.3.0 for opena atv.Put it on tmp and then paste following command in telnet:
opkg install /tmp/*.ipk