HP LJ Pro 4001n Cold Factory Reset

Hold down the OK and X button on the touchpad then power on the printer and in about 7 sec when you see the HP logo  then let to of the OK ans X. After press the left arrow, then right arrow then left arrow again but twice.  This should display a Menu on the sceen and if not press the arrow sequance again.   Select the menu uption then scroll to OOBE.