Samsung, was doing its own :), when the printers or mutifuncionales have configured in their advanced properties update software automatically, load new versions of firmware, and we find out when they do not accept the generic cartridges and / or chip. Samsung released a 2019 update and affected some devices. Fortunately, the latest generation chips are beginning to arrive (2019), it would be convenient to consult with your input provider if they already have availability. You cannot know what the firmware your M2020w has because in these cases, the devices do not print the self-report. But, when you have in your hand the chip with the new version, you install it to the cartridges you have and the problem is solved. The other possibility is to install an original cartridge, but for its cost, it is not the most economical solution :) It is convenient to review the configurations of the devices so that they do not update the software, and do not surprise us with these problems, Samsung did it several times, Lexmark and some HP as well. I await your comment, best regards