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Which model tablet is it?
With its power off, if you hold down the volume down button and press the power button for two seconds and then release it, but continue holding down the volume down button... do you get a recovery menu?
How would you turn the volume up and down then
There are always volume buttons.
Ok, then we need to find you a new firmware to put on the SD card and flash it.
I will see what I can find, and also see if I can get you the software and instructions you will need to reflash it.
Which exact model is it? SYNET7LP?
Ok, I am going to find a good and non-corrupt firmware for you, and see if we can make it easy to flash it.
One more Q. Did it have 2.1 or 2.2 on it? Makes a big difference.
Ok, since you already have 2.2 on it, it makes this more difficult, but I am still looking for new firmware you can flash without permanently damaging the tablet.