How to reset a drum and refill - Brother HL5140, 5240, 5340, 535

How to reset a drum and refill - Brother HL5140, 5240, 5340, 5350

Remove the toner cartridge from the printer
Find the white refill plug on the side of the cartridge and remove with plyers
refill the cartridge using the toner bottle and funnel
replace the white filling plug
Reset the drum unit by following the instructions in the video below