nx-800

Hello All! My tiny local radio shop went out of business because the owner passed. The owners kids put all the stuff for sale in an estate. I acquired 4 Kenwood NX-800's that are read and write protected from the estate sale. I do have the "Engineer" version of KPG-111D v1.40, I am just unaware...

i have a nx-800 uhf. trying to get audio from both the internal speaker and an external speaker mounted on the pump panel outside of the truck. plugging the external into the unit disables the internal. any ideas on how to get this to work?