Printer keeps showing 'Replace Toner' message after installing the Cartridge - Brother TN-3330/3380
Reset process
1) Open the printer front cover
2) Press "Cancel/Back“
3) “Replace drum” appears on the display
4) Press “ * “
5) Press “11“ - (TN-3330)
6) Press “12“ - (TN-3380)
7) When accepted appears on the display, close the printer front cover. Now printer is ready for printing.