Can I use non-Brother or third party supplies with the Brother machine?

I just replaced the toner cartridge and the LCD continues to display the message "Toner Low" / "Replace Toner" / "Toner Ended" or the Toner LED is still on or flashing.

Check the remaining ink or toner level (Linux)

What is the difference between the toner cartridge and the drum unit?

Replace Toner

Replace Drum

The Error LED is still on or flashing after I replace the drum unit with a new one.