How to Reset Toner Level on Brother TN3280/TN3170/TN3130 Toner Cartridge - YouTube
Amazon.com : greencycle (1 Drum + 1 Toner) High Yield Black Toner Cartridges & Drum Drum Unit Set Compatible for Brother TN550 TN580 DR520 use with DCP-8060 DCP-8065DN HL-5240 HL-5250 MFC-8870WN :
The Drum LED is still on or flashing after I replace the drum unit with a new one. | Brother
Restoring The Network Settings To Factory Default - Brother HL-5250DN series Network User's Manual [Page 47] | ManualsLib
How to reset toner and drum counters on Brother Printers