Download Android Jelly Bean 4.2.2 stock firmware for Cube U30GT2 tablet from here or here. Download a newer firmware from here. Download another Cube firmware from here.
Firmware details
Archive name: Cube U30GT2_4.2.2_EN_0626
Image: U30GT2_4.2.2_EN_0626.img
Archive file size: 294 MB
Support: Rockchip RK3188
Build number:rk30sdk-eng 4.2.2 JDQ39 eng.lcp.20130605.172239 test-keys
SDK version: V2.03 20130606
Model number: U30GT 2
FW version: 4.2.02
Boot version: 1.20
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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