I wish I should have not wasted my money on this Brother MFC7820 compatiblke Drum Unit. I have tried it several times to install it but it keep saying on the window-screen of my printer that it is Drum Error, take drum out, slide the blue tab several times from side to side and return it back to the corner on right (triange point). I put drum unjit and toner cartridge assembly into the printer while keeping front cover open . When the monitor showed Replace drum, pressed 1, it swhowed acc

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