How to refill Brother toner cartridges ( TN310 TN315) for HL-4150CDN, HL-4570CDW, HL-4570CDWT, MFC-9460CDN, MFC-9560CDW, MFC-9970CDW printer Please check the link for the video instruction https://www.youtube.com/watch?v=9_RMPG3boeA