Brother TN-850 Toner Reset 

  1.Open the front cover and leave open while completing the following steps.

       2.Push both the "SECURE" and "CANCEL" buttons at the same time.

       3.Use the UP and DOWN arrow to reset the type of toner you have.

       4.Push OK to reset selected toner counter.

       5.When you see ACCEPTED on the display the count is reset.

       6.Close the front cover