Samsung CLP-680ND - "Not Compatible" Error

[carburatediron]

Samsung CLP-680ND color laser printer worked dependably with mix of OEM Samsung Y and K-carts, and aftermarket C and M-carts. I inserted a NEW replacement aftermarket brand M-cart and the printer immediately displayed "Not Compatible K-toner cart." error (with red LED/no print), followed by "Not Compatible C toner cart.", followed by "Not Compatible M toner cart." The printer suddenly identifies THREE toner carts as not compatible, one of which is an OEM Samsung cart! When I put the empty cart back into the printer, the thing continues to display that three carts are "not compatible".

I speculate no one posting to this forum is a printer tech or Samsung engineer. Nonetheless, I followed, multiple times, every recommendation that proports a solution to the "Not Compatible" error:
- Did the "Power off and unplug for n-minutes" ritual;
- Left the printer sit "Powered-on and unused for n-minutes" ritual;
- Removed/re-seated each toner cart;
- Swapped old-for-new carts; swapped in another NEW (aftermarket) cart;
- Cleaned w/alcohol all contacts on each toner cart & inside printer;
- Performed "All Memory Clear" in Tech Mode;
- Changed "Country" in Tech Mode, the set it back again.
None of the described activities cleared the error and restored printer operation.

Things I did NOT do prior to the getting "Not Compatible" error message:
- Remove/reinstall the printer on the computer;
- Install/update printer driver software;
- Access printer via HTML;
- Update ("flash") printer firmware.

All I did is replace an empty cartridge with an identical-brand aftermarket cart. Yet this routine exercise somehow broke the printer.

[Repairatrooper]

2 possibilities:

1. A firmware update was applied that contained updated cartridge security.

2. The sensor assembly in the printer has stopped working and there the cartridges are not read and are then identified as not compatible.