Download the Rockbatchtool from here. Take the version 1.6 to flash the single .img cube stock rom.
It has to be in english, but you see the language button on the left bottom of the screen, where you can change it, if not. Set your device in flashmode. You need a light in the field 1, best would be blue or green. If you have red, you can try to flash, but maybe you need to do it twice or your tablet is still bricked. If you have pink, press switch button before flashing.
Flash with the upgrade button.
JDfense
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