The toner cartridges for the 8026 have a chip on them which count the amount of toner being dispensed from the toner cartridge.
When the printer counts the amount of toner being dispatched from the cartridge has exceeded the amount of "usable" toner in the cartridge, the printer will display the error showing the toner cartridge needs to be replaced.
Crucial the printer also "writes" to the chip on the toner cartridge to say it is empty----You can no longer use this cartridge by simply refilling it.
You need to replace the toner cartridge on the printer with a Genuine New 8026 toner, this should then clear the error automatically and the printer will again spring back to life.
If you are using a new toner you may;
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