3 - 2 B l a n k P a p e r i s O u t p u t o r U n k n o w n D a t a i s P r i n t e d A f t e r S t a r t i n g t h e F i r m w a r e U p d a t e Cause The firmware update was started without switching the machine to download mode.
This message, which appears with the toner cartridge color( s ), notifies you that a toner cartridge has reached the end of its lifetime. It is recommended that you replace the cartridge with a new one. You can continue printing, but the print quality cannot be guaranteed.
If you use version 10.2.0 or an earlier version of the printer driver in an OS X 10.9 or earlier environment and add a MF8000 series, MF8000C series, MF8300 series, and/or MF8300C series device, you will not be able to print if you perform a macOS update. In such cases, you need to delete the printer( s ) and perform the above procedure after adding the printer( s ) again with the latest driver.