duplex printing automatically stopped, device settings say 'automatic duplexing unit' not installed

[texinpr]

envy 4512, windows 10

Automatic duplex printing has stopped, only manual allowed.  The device settings says that the 'automatic duplexing unit' is NOT INSTALLED. 

It's worked for over a year.  Something changed.  How to fix it?

[ShlomiL]

Hi,
Make sure the Automatic Duplexing option is enabled:

Enter Control Panel > Devices and Printers.
Right-click the printer icon, then click Printer Properties.
Click the Device Settings tab.
Set the Automatic Two-Sided Duplex Accessory as installed and click OK to save the change.

Now Automatic Duplexing should become available.

Regards,
Shlomi

[texinpr]

No, that does not work. 

"Device Settings" shows that the "Automatic Duplexing Unit" is "Not Installed" and "Automatic Configuration" is "Off."

"Not Installed" is grayed out and cannot be changed.

I can change "Automatic Configurations" to "Update Now."

"Automatic Duplexing Unit" changes to "Installed."

But as soon as I attempt to print anything,  "Automatic Duplexing Unit" changes back to "Not Installed."

[texinpr]

So today, my wife found that she can print automatic duplex with her iPad.  Good ole Apple.  I still cannot print automatic duplex with my Windows 10 PC.  So I spent MORE time searching the net and found nothing helpful.  I decided just to go to the HP site and DOWNLOAD THE ENTIRE SOFTWARE SOLUTION PACKAGE for my Envy 4510.  Another hour wasted... absolutely nothing changed.

This is typical, I guess.  As soon as the warranty runs out, the thing stops working,  HP won't help, and throws you to the mercy of the community.

OK, well, I can't continue to waste my paper printing single-sided, or waste my time by feeding everything in twice.  Not to mention the two days I've wasted troubleshooting this problem, which was probably caused by HP updates anyway.  As soon as I run out of ink,  I'll go out and purchase a new printer, keeping my distance from HP.