In August (2020) Epson released a firmware update that detects remanufactured cartridges and prevents the printer from using them. Until there is a solution, they will not work if your Epson WF-4740 received a firmware update. My printer was updated yesterday (10th August 2020) and the remanufactured black cartridge installed was no longer recognized by the printer. Then I unpacked and installed another cartridge. The printer doesn't recognize it either. Everything worked before the update.
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