I have a PIPO M9 PRO. I was in the middle of writing an email when my screen froze and it wont let me turn off the tablet or do anything. I have already tried to hold the power button for more than a minute, the escape button as well and I dont know what to do. Tablet doesnt have volume keys or anything. I tried to open it up and taking the battery out but everything is weld together so I cannot just unplug it.And there is no reset hole to put a pin on it. What can I do ? Help please.