IPDA087: What should I do when the touchscreen unresponsive, screen displaying glitches?

In this case, please long-press the power button to restart the device first to see if the device will recovery.
 

If not, please go settings>system>system>reset options>factory reset, to reset your device.

If both methods helpless, please contact Munbyn Support Team along with your Amazon order and a video for reference.