Download Karbonn Aura Power official firmware from below and use the flashing instructions contained at the end of this post to flash without stress.
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Karbonn Aura Power - Download
How to flash Karbonn Aura Power stock ROM
Follow the flashing instructions http://hibbydabby.blogspot.com /2016/03/easy-mtk-firmware-flashing-installation.html" target="_blank">here.