Go to service mode:.
- Turn off the printer
- While holding STOP/RESET button, press and hold the POWER button.
- Release the STOP / RESET button (power button is still on hold.)
- press the STOP / RESET 6 times.
- release both buttons simultaneously.
- Run ServiceTool MP287 software printer.
- Click Main -> Patern, the printer will print one page
- Click "EEPROM Clear"
- Click "EEPROM", the printer will print once again.
- Turn off your the printer by pressing the power button. - Turn on again - Finish