1. Make sure that the printer is on while changing the toner or it will not know that a change was done. 2. Speaking from experience doing support for a lot of

1. Make sure that the printer is on while changing the toner or it will not know that a change was done. 2. Speaking from experience doing support for a lot of them, brother* printers are notorious for not realizing the toner (even with originals) was changed. There are ways to reset the counter though(Holding two buttons while powering on). It's usually mentioned in the manual. * It's the only brand I know with that problem.