Back button not working after display change

[Mudit]

I got display of Xperia Tipo replaced, and the technitian told me that he has calibrated touch as well.

Everything is working fine, except for the back button, which intermitently does not work. Sometimes it works and sometimes does not.

Is this a software issue or a hardware. Can this be fixed without going to the service center (I want to avoid going there as it's quite far away)?

I checked out for software update. It shows that there is no update available.

[Mudit]

Thanks for the suggestion, but from the documentation of this app, it does not look like it can fix any issue.

[_alexdon_]

Then I do not think you can do it,unfortunately.