Download Android Jelly Bean 4.2.2 stock firmware for Amoi N820 smartphone from here or here.
Archive: Amoi N820 4.2.2 fw
Firmware: Android Jelly Bean 4.2.2 stock
Build number: n820-user 4.2.2 JDQ39 eng..1377181273 release-keys
Archive: Amoi N820 4.2.2 fw
Firmware: Android Jelly Bean 4.2.2 stock
Model: Amoi N820 smartphone
Image file size: 186 MB
Platform: Mediatek MT6577Image file size: 186 MB
Build number: n820-user 4.2.2 JDQ39 eng..1377181273 release-keys