To improve the printer function, the firmware has been upgraded.  These modifications apply to all current and existing models.  During the Sleep Mode, when printing from the network, there is a case that the printer may not return from Sleep Mode.  This problem has been corrected.  The ink agitator movement may rarely function when returning from Sleep Mode.  This problem has been corrected.  Perform the optimization of waste ink amount (Reduction of pre-firing amount).