Hard Reset MICROMAX Canvas Unite 4 Pro

First method:

First of all, turn off the cell phone, by using the Power button.
Then press and hold together the Volume Up and Power key for a few seconds.
You can release held keys when you see an Android icon.
Then use Volume buttons to select "wipe data/factory reset" and tap the Power button to confirm.
Afterwards choose "yes" from the menu, and accept it with Power button.
When a Recovery Mode appears again on the screen accept option "reboot system now" using Power rocker.
That's all. The hard reset operation should be completed.