Download Android Jelly Bean 4.2.1 stock firmware for Lenovo P780 smartphone from here or here. Download previous firmware from http://mallcopwarrior.blogspot.com /2016/02/download-android-jelly-bean-421-stock.html" target="_blank">here. Download Android KitKat 4.4.2 stock firmware for Lenovo P780 smartphone from http://mallcopwarrior.blogspot.com /2015/06/download-android-kitkat-442-stock_30.html" target="_blank">here. Download another Lenovo firmware from http://mallcopwarrior.blogspot.com /search/label/lenovo" target="_blank">here.
Archive name: Lenovo_P780_4.2.1_20160930
Archive file size: 407 MB
Firmware: Android Jelly Bean 4.2.1 stock
Model: Lenovo P780 smartphone
Platform: Mediatek MT6589
Build number: P780-user 4.2.1 JOP40D Lenovo P780 release-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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