Installing firmware update on CM2320 printer sometimes create another problem. Restoring to the previous firmware can fix the problem, but the old issue still persist. Instead, you can try applying these workaround before deciding to restore the firmware.

Here’s the steps you need to do:
- Reset printer settings
- Set printer to the new configuration
- Activate duplex-printing on the printer’s configuration page
- Reinstall printer drivers
Perform a Printer System Reset before reinstalling the drivers. Hope this solve your problem on CM2320 printer.
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