Pull out all cartridges and take a flash light, look inside the printer, in the upper-back part you'll see black pins, check if are they clean and
embedded, if black pin in even a bit loose, you'r need to solder a new pin on the PCB
HI Jdingla,
Hi, I'm Zen and I'd be glad to assist you today.
If you click the link below, you can access a step-by-step guide on clearing such an error message rather than me typing it out for you.
How do clear the message Unable to or Unable Brother Still having Problem Then follow Us For
Brother Printer Support
Hi luks,
Go To Below Brother Printer Video For Your problem,
Hope It's resolve all Your Printer Problem,
Or
Still having Problem Then follow Us ForBrother Printer Support