In case that you have problem on firmware update for your HP CM2320 printer, because you have a problem when printing duplex on a Mac to the printer, then you can try to read below solution, download and upgrade your printer firmware. Upgrading firmware is often necessary when installing drivers, rolling back, or even change the printer settings don’t work.

Resolving the problem of can’t printing duplex on Mac to printer, there are steps you must follow:
- Read the file named “AIO manual uninstall.docx”. Follow the steps on the attached document.
- Download the software here
- Install the software completely
- Add printer
Just to make safe, you’d better remove the installation of old printer and preferences files on the system. Before reinstalling the driver, you can also perform a “Printer System Reset”
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[...] firmware update on CM2320 printer sometimes create another problem. Restoring to the previous firmware can fix the problem, [...]