After updating my firmware the screen on my X6 has become intermittently dead.
When it decides to give up, the physical buttons work but the touchscreen is unresponsive. It sometimes fixes itself by taking the battery out but mostly i have to reinstall the firmware update (v40).
Once it decides to work again it will be fine for a few hours or days until the screen stops responding.
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I would suggest you that now, your phone screen seems physically damaged. So, there is only one option for this to fix this problem. You should change your phone's screen. This might be help to run your phone correctly.