Killed the touch on the tablet, how to recover?

Question

Android

I recently purchased a Window Yuandao N70 tablet, and I really wanted to put firmware 4.1 on it (both custom and official at the moment are only 4.0.4).
Since I didn’t have much experience with Android, I did a big stupid thing - I tried to install firmware from Pipo U1 on it, since it is based on the same chip, graphics and has the same 7 inches, but it already has 4.1
for it the screen did not light up, although it loaded according to the response of the operating system, since the operating system recognized the connection of the device via USB.
I flashed it back to the official firmware, but the touch did not work. Generally.
I understand that I messed up the drivers for the wheelbarrow, but flashing it to all firmware suitable for the tablet did not help.
I tried to google on the topic of drivers, I found what I need to edit in the driver firmware for the wheelbarrow, but how to open the img image? (I have mac)
Give advice where to dig.

Answer 1

If you were unlucky and the tablets still had similar touchscreen controllers, then the Pipo U1 kernel (or userspace daemon) could upload its firmware to the controller. This led the touch to inoperability. You need to return the original firmware somehow. It can be either in the kernel (a large array of chars), or lie somewhere in / system. Or it may not be in the system at all, but only from the manufacturer / support.
Check if it is possible to update the firmware from your current driver (look in /sys for something like fw_update)
See dmesg output.
Find out the model of the touch controller.
It's hard to say what happened without the source code for the tablet cores.