I am unable to go back to home screen when I press the homescreen icon or go to the previous screen when I touch the back arrow icon either!
It could be that your touchscreen (digitizer) is PARTLY broken.
To confirm, try rotating your tablet 180 degrees, and then touch the home button again.
If it works when rotated then you need a new touchscreen.
I hope you are good with precision tools, and have good mechanical skills and instincts: it's a rather intricate job to locate the locking tabs and screws that attach the touchscreen to the insides of the tablet, then remove them, and finally to replace a touchscreen. And then reattach all necessary fasteners, and test whether it will work properly.
EASIER FIX: go to Ebay and buy a used Trio tablet. it may cost you only $40 to $50 maybe even less!
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