nano /lib/systemd/system/serial-getty@.service

Add “-a root” after -/sbin/agetty

From

ExecStart=-/sbin/agetty –keep-baud 115200,38400,9600 %I $TERM

to

ExecStart=-/sbin/agetty -a root –keep-baud 115200,38400,9600 %I $TERM

Save and Reboot