Download Android Jelly Bean 4.2.2 stock firmware for Allwinner A20 devic from here or from here.



Firmware details
Archive name: juno_A20_805launch_0425
Image file: juno_A20_805launch_0425.img
Archive file size: 282 MB
Firmware version: v2.0

Style: SoftwinerEvb
Company: softwinners
Platform: Allwinner A20
Pixels: 1280 x 720
Build number:
sugar_yunbo1-eng 4.2.2 JDQ39 20140714 test-keys


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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