How can I upgrade software of my Micromax Unite 4 Pro?

Dear micromax company i have a mobile called unite 4 pro in that my mobile  has not have volte micrimax has left the new software to upgrade but i am trying to download it i had downloadded it and while instaling it switch of nd starts upgrading but in midile it will stop nd its power on nd after it on it will say u failed to upgrade ur software so pls help me to fix the problem i need it thanks

Hi Mahesh. Do you still have enough phone storage to make the upgrade? Please check.

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