To override your Brother toner Low Tn450, you should power on your printer first.
Now, you need to go to the front panel of your printer to open the toner access door.
Next, you have to press the Clear/ Back button and go to the toner cartridge lists.
Here, you need to find out the toner cartridge which is giving you ‘Replace Toner’ message.
Now, you will have to press 1 to complete the override process.
In case of any issues, you should take assistance from the technical geeks at anytime.