If not root & dreambox then I am most surprised as there is no notification in the description for any other details.
Could also be that none is set. Even so you would still need to use root & dreambox for FTP as FTP will not normally connect without a password.
You can try using DCC.
Open Telnet session as root user.
Type passwd
Set your own password.
Or you can Telnet directly from your computer to the box and login as root. Then use the passwd command to set your own password.