Download Android Jelly Bean 4.2.2 stock firmware for Lenovo A399 Smartphone from here or from here. Download previous firmware from here.

 
Firmware details
Firmware: A399_USR_S023_Lang_EKL
Model: Lenovo A399 Smartphone
Archive size: 445 MB
Platform: Mediatek  MT6582 
Project: wt98519
Config_version: V1.1.1
 



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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