at first backup your all of user data. after flashing all data will be wipe.
Make sure your device battery is not empty.
when you know see your device operating system is Corrupted Phone auto restart when you turn on your smart phone device is stuck only show micromax logo on screen at this time you need upgrade or flash your smart phone. try always latest version flash file using for flash latest version better for device performance.
Download Link VT0355 Here
OR
Download Link VT0370 Here