You can reset your dreambox password using dreambox remote:

1.install tuxbox commander using addons button
2. Start tuxboxcomander
3.go to in /var/etc/ and open the file passwd
4.press 4 on remote to go into edit mode.
The first line is root:*****:0:0:root:/home/root:/bin/sh
where the ****** delete it (by using remote arrows to move cursor right and then pressing volume minus)
delete *** until upto :0:0:root

and press ok and exit -> save

the first line should look like this after the edit
root::0:0:root:/home/root:/bin/sh

then login with user root and password leave empty

you could telnet and change the empty password with your own so known can easily hack into your dm box.

root:V26.Uf.kSvoYg:0:0::/:/bin/sh sshd:*:65532:65534::/:/bin/false ftp:*:65533:65534::/:/bin/false nobody:*:65534:65534::/:/bin/false --->>>>>>>> root::0:0:root:/home/root:/bin/sh 

I now one easy way:

1.install tuxbox commander using addons button
2. Start tuxboxcomander
3.go to in /var/etc/ and rename file passwd to passwd_
4.go to in /var/etc/ and rename file passwd- to passwd

then login in your dreambox with user root and password dreambox and that's all