I do apologize for the slow response.
We found out that when the black cartridge cannot recognize for a brother printer, it is most likely that the cartridge is not fitting inside the printer all the way.
We discovered through trial and error , that if you see the black cartridge, you will notice that there is a L-Shaped black plastic that goes in the back of the cartridge. This L-Shaped black plastic is directly above the nozzle of the cartridge (the portion of the cartridge with the plastic film).
You will need to remove this L-Shaped black plastic. The easiest way to go about this, is to open the cartridge. You can split the cartridge in half (don't worry about the ink spilling, as it is encased in another plastic case within this cartridge shell). Please make sure you remember all the pieces on the cartridge, as splitting it down the middle to remove the L-Shape plastic, may make the locking arm or chip fall off.
You can also just pry open the back of the cartridge and wiggle out that plastic piece. Let us know if this works for you. It has worked for us and several customers with the same issues.