Touchscreen and trackpad won't work after installing new OS

i want to ask why that after i upgraded my os, and during the start up when i have to scroll down the aggrements text my trackpad and my touchscreen won't work. is that any way to solve this problem? i beg you to answer my question please. i would be very grateful. thanks

Did you actually upgrade to OS 7.0 or to OS 7.1?
What OS were you previously on that you want to downgrade to?
For the application in question, go to Options > Device > Application Management. Find the app and delete it.
Now, go back to AppWorld and install it again and see if it works correctly.
For most apps that I know of, if they worked correctly on OS7, they will be fine on OS7.1
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Touchscreen and trackpad won't work after installing new OS

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