Q：Touch has no effect
A：1. Press the power button to lock the screen, then turn the screen on again to see if the touchscreen is responsive.
2. Power off and then power on to see if the touchscreen is responsive.
3. You can use an OTG connection with a wired mouse to check if the problem is with the touchscreen or a system freeze. If it's a system freeze, you can enter Recovery mode to restore factory settings.
4. If it's a touchscreen problem, you'll need after-sales service for repair.
