How to refill the Brother TN2000 toner cartridge

Brother TN2000/TN350 COMPATIBILITY: DCP 7010, DCP 7010L, DCP 7020, DCP 7025, HL 2020, HL 2030/2030B, 2040, 2050, 2070, FAX 2825, IntelliFax 2820, 2920, 2910, MFC 7225N, MFC 7420, MFC 7820