Invalid toner - Samsung ML-3051ND Laser Printer

You must use Genuine Xerox supplies from Xerox, especially if you are on a lease and supplies deal. You slip a refilled or 'compatible' replacement toner from 'The Toner Guys', the machine locks you out until reset by a Xerox tech.

https://forum.support.xerox.com/t5/Hardware/Invalid-Toner-Cartridge-error-Workcentre-3615/td-p/199538

and although it is a different model, it is the same series

Turns out the WorkCentre 3615 has two types of toners - None Metered 106TO2722 and Metered 106RO2724. Both toner boxes say WorkCentre 3615. You must order the correct one or you will get this error and the machine won't work at all. Who knew? Xerox admitted they sent us the wrong one, so they are offering to fix with a code over the phone.

https://www.google.com/search?q=xerox+workcentre+3215+invalid+toner+cartridge

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Samsung strongly recommended original supplies as it has programmed sensor/fuse in it,

the best thing to do is buy the original toner. how ever if u really can't then try changing the blue colored one

Use the RESET feature (see the user manual page 43 or about).
Set it to: RESET ALL.
The problem should now be solved.

how to fix invalid black message after replacing a toner And I have the same problem. I buy 4 new toners and for each one i get notice from xerox 6125 invalid black, or invalid yellow. What do I need work?

dear my friend this printer toner has a counter chip,when toner is out or too low then this chip is disable.May be you buy a new toner not compatible just original.

the toner is defective you need to replace it

I have the same problem in a CLP-300. I have tested 3 diferent aftermarket chips from different manufacturers and always the same message: "invalid black toner" and the black toner light keeps red

You may need to get a new chip on the toner tray. If you go to the place that sold you the toner, they likely have the chip that you need.

reload the driver again and if it persists, change the toner