Unfortunately the telnet window cuts off much of the dumpmdm command.
If you are using the windows Telnet client, do the following.
Open Start Menu
Type Telnet
Click "Open as Administrator"
In the Telnet window type the following:
set logfile C:\dumpmdm.txt
It should then say "Client logging on"
Then type:
open 192.168.1.1
It will open a new Window asking for username, type:
admin
then type your password in the next box
It will then show:
>
Then type:
dumpmdm
It should then record everything to to a file named telnet.txt
Close the telnet window.
The file is saved to C:\dumpmdm.txt
Located in "This PC" then "Local Disk (C:)"
Simply search the file for the word supervisor, and you have the password.