Ulefone Be Touch 3

Hello,
I have the Ulefone Be touch 3 and i want to really increase the sensitivity of the screen.
Because when i write a text message, it did not write the half of the words.
I tried the app Screen Booster but it did not work.

I see in the net that i have to root to add specifications on a file Build.prop.
But for that, i have to root.
Someone have an idea ?

I tried the root method :

-Extract RAR
-Put UPDATE-SuperSu to your phones storage
-Install drivers to PC
-Open SP Flash Tool
-Check boot and recovery and select files from files-folder (Uncheck others if they are checked)
-Push download button
-Remove battery from the phone and connect USB
-Disconnect USB when SP Flash Tool says OK
-Install battery and start phone with vol up + power
-Select install zip from sdcard and select super su
-Reboot phone and you are done
-Click thanks if you are satisfied

But I have an error :
PMT changed for the rom

I am afraid to change the download only by firmware upgrade ...

Thanks in advance for your help
Avy

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