Part of touch screen is not working This is a weird touch screen issue as only part (2 blocks) of the screen is not working. I tested the touch functionality via "Touch Test" and observed that 2 red zones are not responding to finger tap (see screenshot). Where there are 2 thin gaps (actually 2 lines) are responsive. This happened after an app update (15 apps). I didn't drop the phone during this period. So I am suspecting this might due to a software issue. What could cause this issue?
I might be late, or maybe not. I confirmed (here) this issue being adressed into a firmware where the asigned screen size was bigger than it was supposed to be. In my case, a 7" tablet flashed with a 10" screen size tablet, downloaded straight from the tablet's company support page, for my specific tablet.

The guy from the link applied a solution by himself, using pieces from another firmware so the screen size matched the desired one. You can either do this or try another firmware, if it exists.