Download Android Jelly Bean 4.2.2 Stock Firmware for Egreat K3 Game Box

Download Android Jelly Bean 4.2.2 Stock Firmware for Egreat K3 Game Box from here or here.

Firmware details
Archive: EGREAT_GAMEBOX01_1.2.1-R-20140514.0928
Image: EGREAT_GAMEBOX01_1.2.1-R-20140514.0928.img
Archive size: 527 MB

Model: Egreat K3 Game Box
OS: ALyun / YUNOS
FW version: 4.0.04
BT version: 1.34
Platform: Rockchip RK3066 / RK30
Build number: EGREAT_GAMEBOX01-user 4.2.2 JDQ39 eng.suborsb.20140514.092453 test-keys / JDQ39
Vendor version: RK3066_R-BOX_ANDROID4.2.2-SDK_V1.0.0_130308
Company: EGREAT_GAMEBOX01
Model:  EGREAT_GAMEBOX01
 

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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