[Q] Recovery mode without menu in chinese tablet - Android Q&A, Help & Troubleshooting

Hi all,
My problem is this:
I have a 10'' chinese tablet without any type of identification, serigraphy or brand in it, and neither in its box. It hasn't any type of special feature like standard USB or RJ45 interface to use it to search its model.
The tablet is stucked loading in the Android text screen, so I can't use ADB shell to control it and do a factory reset.
I enter in recovery mode with the Power + Vol+ buttons, but the tablet hasn't menu in recovery mode, so I can't do a factory reset this way. The tablet have only 3 buttons (Power, Vol+ and Vol-), and I tried all possible combinations that I've seen in all internet sites (I've spent hours trying it).
ADB shell don't work in this mode, and this tablet doesn't have bootloader or fastbot mode, neither download mode.
The microcontroller is an AllWinner A10.
Then I have an unbranded unidentified tablet that doesn't boot and that hasn't menu in recovery mode... Someone can help me in how to restore to factory defaults this sh*t? ¿Or maybe I have to use it as chopping board?
Thanks in advance.

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Dear admin, am also having the problem of itouch i 704, pls help me how to hard reset this tablet or give any flashing solution... waiting for ur reply.......
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