Hi, If your touch screen is not working, there's just 2 major causes of such, either a hardware cause which might be either the phone falling on a hard object or in water which could damage the sensor board and either the screen is malfunctioning and needs to be calibrated.
If you can access the menu of the phone, i will advice you calibrate the screen first before you send it to a repair shop. There is no updates to download for such problem as updating the firmware of the phone would do nothing but change the settings of the phone.
To calibrate the screen, you will have to go to the phones menu, go to settings, then you select the calibrate screen, it will show you some stars to touch and once you touch them properly, then your screen will be able to work effectively.
But if you cannot access the menu because of the touch, then i will advice you send it off for repairs, and what to repair on the phone is the sensor board.
Flex of the phone can also affect the function of the touch screen.
The flex of the phone is located inside the phone, it controls the functions of the screen an also the keypads of the phone.
The flex is a thread like object that is located inside the phone. To see the flex, you will need to disassemble the phone to get to the flex of the phone.
After replacing the phone flex, your done.
You can get a replacement flex from any of the phone repair stores around you.
Hope it helps.
Thanks for using fixya....
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