I bought the cartridge for my printer MFC J470DW because these were supposed to also fit. After the original black cartridge was empty and I wanted to replace it, I was told that the new cartridge is not detected. Through a smart exchange with the original of the cartridge, the solved your issue and it was printed normally. Now is black but printed only very weakly, in a light gray to almost no longer legible after only 3-4 times Print. It appears, the cartridge was full, they can not print properly. Fehlkauf