First look at your printer identification.
You can see it in either the display or on the startup or configuration pages.
It must have a "D" in the name for you to be able to do automatic duplexing. i.e. 8400DN or 8400DX . Then you can scroll to printer setup
and select defaults, and then turn on the duplex, or double sided printing.
If yours does not have a "D" i.e. 8400, 8400N then you would need a new sim card to enable the duplex option.
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