I was using toner from LD Products for a couple of years, an update came down and the Printer screen started showing open the cover and install toner.  So I took the LD Toner out, put my old Brother toner in, and it fired right up.  I then put the old LD toner and it showed the same error message.  I say screw them if I want to use another toner than what Brother Canada sells, I should be able to without Brother sending an update blocking me from doing that