Download latest Android Lollipop 5.1 stock firmware for AD320 RK3288 board from here or from here.   

 
Firmware details
Firmware: AD320_rk3288_5.1_wifi8723bs_20160530
Image: update.img
Model:AD320 RK3288 board
Image file size: 214 MB
Platform: Rockchip RK3288 / RK32
Boot version: 2.30
FW version: 5.0.00
Model number: AD320
Company: Android
Build number: AD320_20160530_f7f781a
SDK version: RK30_ANDROID5.1.1-SDK-v1.00.00


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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