If the touchscreen of your 10.1 inch Android 4.4 head unit (11-RQ0256) responds slowly, inconsistently, or no longer responding at all, please follow this method.

10.1 inch quad core Android 4.4 head unit

 

Normally these problems are caused by wrongly disconnecting the screen panel flex cable while the quad core Android head unit is powering on. It's very simple to fix this issue. Just unplug the power cable connector which is behind the unit and replug it again. If you've already installed this universal Android car stereo in your vehicle and unable to unplug the power cable harness, please turn off the car ACC at least 2 minutes so that the unit will be disconnected from the power. Then turn on the ACC again and the problem will be solved.

Here's a video for reference: