HP ENVY 4520 stopped duplex printing

[Kim Spicer]

So out of the blue my printer will only let me print on both sides manually, The duplex printing option keeps to reverted to 'not installed', even though I keep on clicking on automatic updates. It updates instantly which allows me to click the duplexing on and I apply the instruction, but when I try to print on both sides, it tells me to do it manually, and will only print on one side. I have spent over 7 hours on this today.

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