Default [HELP] Stock Firmware Tablet PC Allwinner A23 GA10H


I need a stock firmware image to flash and unbrick a Tablet PC Allwinner A23 model GA10H. Description:

Model No: GA10H
Operation System: Android 4.2
Screen: 10.1 inch TFT 5 Point Touch Capacitive Screen
Resolution: 1024x600(16:9) Pixel
CPU: Allwinner A23 ARM Cortex-A7 Dual-Core 1.5GHz
GPU: Mali-400 MP2
Nand Flash: 8GB

The manufacturer´s website (AZhuo Digital) don´t offers the stock firmware to download.

Please help me.

Thanks a Lot

Luciano Scharf