Download Android KitKat 4.4.2 stock firmware for Lenovo P780 smartphone from here or from here. Download Android Jelly Bean 4.2.2 stock firmware for Lenovo P780 smartphone from here. Download another Lenovo firmware from here.
Archive name: Lenovo_P780_VIBE 4.4.2 fw
Image: Lenovo_P780_VIBE_SJDS_ROM_20150629 & Lenovo_P780_VIBE_SJJL_ROM_4.4.2_20150629
Archive file size: 0.98 GMB
Firmware: Android KitKat 4.4.2 stock
Model: Lenovo P780 smartphone
Platform: Mediatek MT6589
Build number: prada-user 4.4.2 KOT49H VIBEUI_V2.0_1512_7.149.1_ST_P780 dev-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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