Hello. I have a problem. I have a samsung ml 3471nd printer. but I cant print on both sides.?

... even i set the duplex settiings.. can enyone help me please ? or:... even i set the duplex settiings.. can enyone help me please ?

... even i set the duplex settiings.. can enyone help me please ?

or:... even i set the duplex settiings.. can enyone help me please ?

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