These are a few steps to try in case of toner error issue after installation:
a. Remove and reinstall the toner cartridge carefully and correctly
b. Switch off the printer and main outlet and power it back on after ten seconds
c. Gently clean the toner terminals with a soft, dry cloth before reinstallation
If these steps do not remedy the issue, contact Brother customer support. If youre using a compatible or remanufactured toner cartridge, get in touch with the supplier for replacement or assistance.