[Q] please help me to fix my wintouch tablet - Android Q&A, Help & Troubleshooting

I have purchased :laugh: a ( wintouch q 75s - dual core - a23 - android 4.2.2 - firmware 2.0.8 - kernel 3.4.39 - code Q75SA406131552 ) Tablet 15 days ago
and then suddenly appeared on the screen the word ( DEMO )
HOW CAN I FIX THIS PROBLEM
Do I need to new Software
Please help me :angel:

ancient forum iam Waiting for your help !!! Not despair yet !!!
Is it a difficult problem for this class
no body give me a solution to my problem in this ancient forum​

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