Generic Brother TN3440 Toner Cartridge The Compatible Brother TN3440 black cartridge is a low cost alternative to using genuine Brother supplies. You can expect up to 8,000 pages @ 5% coverage. Use with Brother printer models HL-L5100dn, HL-L5200dw, HL-L6200dw, HL-L6400dw, MFC-L5755dw, MFC-L6700dw and MFC-L6900dw. Brother Printer Firmware Please note – Generic cartridge suppliers make every endeavour to update chips to the latest firmware. Do not update firmware and be sure to turn off automatic updates in your printer to continue to use generic / compatible ink cartridges. If you choose to update firmware in your printer the chip may not be recognised.