OK so I need to follow these instruction for using the terminal
http://www.riocar.org/FAQ/7/82.html#82

I can use putty on Windows 10.

How do I know of success?
Do I get this response if there is no s/w on the unit?

empeg-car v0.04 19990121 (altman@empeg.com)
If there is anyone present who wants to upgrade the flash, let them speak now, or forever hold their peace...it seems not. Let fly the Penguins of Linux!

Once I confirm I can get a response from the unit I'll then figure out how to transfer the big disk builder to the unit and run it.