I had the same issue since we bought a used MPM and the previous owner didn't include the passwords. I emailed MPM and here's the way to recover passwords.
To recover lost passwords:
Plug in a keyboard, and power up the machine.
Press the "ESC" key. This will bring up the DOS screen.
Navigate to the AP directory. Use the command "CD.." to navigate to a higher directory and "CD AP" to navigate down to the AP directory from the C:> directory.
Once at C:AP> type in "type password.bin" this will display what the current passwords are set to. If that doesn't work try using that command at the C:> directory.
Write down what the passwords are currently set to, DO NOT attempt to change the passwords from within DOS, damage to the system files may occur.
Restart the machine, Login as Supervisor and change the passwords as desired.
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