Help S4 VE i9515: back and option keys disabled, impossible to enable them

[Deleted User]

Hi,
I have a S4 VE i9515, suddenly the back and option keys have been disabled and I'm not able to use them any more. I did not make any change or software update.
I tried to restore the phone via default setting and via recovery without success. I searched on the web, but the only solution that I found is to install an app as https://play.google.com/store/apps/details?id=com.phoenixstudios.aiogestures.
Finally, I tried to install a custom ROM in particular the latest unofficial version of lineage OS https://forum.xda-developers.com/ga...om-cm14-1-galaxy-s4-jfvelte-gt-i9515-t3534552 that works well, but it did not solve the problem of keys.
Do you have any suggestions?
Thank you

 

[sonicbluemustang]

Actually the stock Rom has a feature built into it that creates a little mini panel on the screen that pops up a key window.
Go to Settings-MyDevice-Accessibility-Assistant menu. then turn it on and it will pop up. then tap it.
Good Luck with.

 

[Deleted User]

Hi,
thank you for your reply. Since this feature is very similar to using back button app, I prefer to avoid reinstalling an old android version.
So do you confirm an hardware problem?

 

[sonicbluemustang]

I would assume so if they do not work with a different rom.

 

[nu2andy]

Have you had a broken screen/digitizer replaced? I would suspect key/button fault as you have suggested. (hardware)