Download Android Jelly Bean 4.1.1 stock firmware for Cube U30GT tablet from here or here. Download another Cube firmware from here.
Firmware details
Archive name: u30gt-hs_V1.01_20130225
Image: u30gt-hs_V1.01_20130225.img
Archive file size: 255 MB
Support: Rockchip RK3066
Model number: U30GT-HS
FW version: V1.01 / 4.0.04
Boot version: 1.24
Build number: rk30sdk-eng 4.1.1 JRO03H eng.rjg.20130128.115321 test-keys
SDK version: RK30_ANDROID4.1.1
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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