Printer keeps showing 'Replace Toner' message after installing the Cartridge - Brother TN-2110 / 2120
Reset process
1) Open the printer front cover
2) Press "Cancel/Back“
3) Press "Start"
4) Press the up-arrow until display shows “00”
5) Press "OK"
6) When accepted appears on the display, close the printer front cover. Now printer is ready for printing.