Note : Please make a backup of installed apps in your apps and contacts, messages you may require to factory reset your phone
Do it on your own risk, Me and nor Xda responsible for any thing happened to your device.
1 extract this file it contains 3 folders
2 first open driver folder and install the vcom drivers (only for xp/vista/7)
3 switched off your phone and take out your batter from it
4.now open sp_flash_tool folder and run Flash_tool.exe
5 click on scatter-loading and select MT6589_Android_scatter_emmc file from "Micromax a117 ebr files" folder for 2.5 GB and for other storage requirement select form EBR.rar file uploaded below. Just replace ebr1 and ebr2 given in first attachment by the new ebr files in second attachment
6 click on download on sp tool a popup will appear just ignore it and select yes
7 now connect your phone using usb cable
8 sptool will detect your phone and a yellow bar comes at bottom of sptool
9 don't disconnect your phone until a green circle would appear (it just take 5 seconds after phone detected by sptool)
10 after the green circle appear click on x and disconnect your phone and put the battery and restart your phone.
Hit thanks if you like