Brother has implanted chips in its toners, which means that if your printer gives a recognition error in the cartridge, the easiest thing is that it is due to a manufacturing error or a firmware of an older version. In the case of Brother TN247 / TN243 toner, compatible with the DCP L3510CDW, DCP L3550CDW, HL L3210CW, HL L3230CDW, HL L3270CDW, HL L3280CDW, MFC L3710CW, MFC L3730CDN, MFC L3740CDN, MFC L3750 CDW, four MFC L3750 CDW printers, CDW (MFC L3710CW, MFC L3730CDN, MFC L3750CDW, MFC L3770 CDW) have an easy to perform reset function that works quite well.