Kyocera 400ci 'add toner' message after new installed

Hi all

This machine is requesting a new black toner yet a new genuine Kyocera toner has just been replaced.

The black dev unit was replaced within a month ago.

I know the dev motor is running as I can see the auger turning by fooling the machine into thinking the door is closed with a toner cartridge installed and using my mirror to see down the toner chute.

the one thing I did notice was I never saw the motor/gears running which are behind the black toner cartridge to turn it........

The machine gives no error code though.....

I do know the firmware is not current but I don't have the current firmware to load.......

Any pointers anyone?

thanks in advance