How to Solve HP Envy 4520 no longer auto double sided printing

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How to Solve HP Envy 4520 no longer auto double sided printing. I would be happy to help you with your HP Envy 4520 Printer. I understand that auto duplex printing is disabled after windows 10 update and you have already done some preliminary troubleshooting.

Don't worry though as I have a few steps to determine the issue and find a solution as well,

1. Right click on printer, select printer properties.
2. Select the Device settings tab.
3. Ensure that the duplex unit is set to Installed rather than Not installed.

Let me know if that works.

Cheers.