To reset the 'Toner Life End' / 'Replace Toner' message on Brother HL monochrome (black and white) printers:
To reset the 'Toner Life End'/'Replace Toner' message on Brother MFC monochrome (black and white) printers:
To reset the 'Toner Life End' / 'Replace Toner' message on Brother DCP, MFC and HL colour printers: