If you buy a "new" MP 2100 and it arrives with password protection, there is a solution. It is called Data Rescue. It auto docks with a computer running NCU.
You need to install the package on a flash memory card somehow (borrowing a friend's Newt worked for me). The first time I tried this package, it didn't connect with the computer - communications error. I tried it again tonight and with no changes to the setting it connected to the Mac (Weird!).
Choose backup. Then restart and restore from the backed up info. The password is not restored and the Newt starts up normally.
For the curious:
My "new" Newt came from Bristol Meyers Squib with some proprietary BMS software that needs access to a database that was not installed.