WM8850-Mid Remove firmware

I searched and found a thread about how to root my device and install firmware. So, I rooted first which worked. Then I tried a firmware from this site, namely MaPan7650B. When I did this my tablet boots up like all is well but my touch screen does not respond anymore. So, I need help removing this firmware to go back to defaults. I have no idea how to do it.

I'm desperate.

SPECS:
Android Tablet 7''
Model number: WM8850-mid
Android version: 4.0.3
Kernel Version: 3.0.8
Build Number: 4.0.3 ICS Ver1.3.0-20120911.025941

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