These boxes are closed so no updating of cccam files, cccam is part of firmware to use test line you will have to create CCcam.cfg file using notepad then copy your test line into this file save it then copy to usb stick.
Insert the usb stick on the skybox F3 then press menu/network local setting/camds setup/cccam client setup/update file by usb/ press OK on the CCcam.cfg and then Yellow for ( read).
Please note after menu you might have to press 6666 to see secret menu and see network local setting.