Download Android KitKat 4.4.3 stock firmware for Lenovo A3900 smartphone from here or from here. Download another Lenovo firmware from http://katieandmaxtron.blogspot.com /search/label/lenovo" target="_blank">here.
Firmware details
Archive： Lenovo_A3900_4.4.3_20160914
Image: Lenovo_A3900_SJJL_ROM_20160914A
Model: Lenovo A3900 smartphone
Image file size: 444 MB
Platform: Mediatek MT6752
Build number: pxa1L88H2-user 4.4.3 KTU84M A3900_S134_150814 release-keys
Platform: Mediatek MT6752
Build number: pxa1L88H2-user 4.4.3 KTU84M A3900_S134_150814 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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