Upgrade the firmware first without the duplex unit installed. Keep in mind the formatter has nothing to do with the duplex unit being seen since the duplex unit is a separate attachment. Once you have updated the firmware, turn the printer off and then back on. Now turn off again and then insert the duplex unit. Turn the printer back on and it should not see the duplex unit and it should work. There was an issue with updating the firmware on these printers with accessories attached and it is possible the other formatter had this done so it retained the problem. Updating without accessories attached should fix the problem.
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