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Currently, the app does not support duplex scanning. It was designed to support a variety of scanners/printer. This somewhat limits the options available and the 2-sided scanning is not supported.
Though you can't automatically duplex scan via HP Smart App, you can setup "Scan to Email" for your printer and send to an email configured on your iOS device. You should be able to select Two-Sided scanning from the printer screen once scanning to an email is configured.
there is no reset for EWS password on these units and I'm afraid this could be a hardware malfunction, that said, I suggest you talk to HP support and discuss your options, follow the below steps to get started:
1) Click on this link - http://www.hp.com/contacthp/
2) Click on Sign-in or select the product using the below step:
3) Enter the serial of your device.
4) Select the country from the drop-down.
5) Click on "Show Options".
Fill the web-form, to populate a case number and phone number for yourself!
Also, if you are having trouble navigating through the above options, it's most likely because the device is out of warranty, if yes? please send me a private message with the region you are contacting us from,
here's how private messages work: Click here for details.
P.S: Welcome to HP Community 😉
If you wish to thank me for my efforts, you could click on "Accept as solution" on my post as the solution should help others too.