These are the instructions to Flash Stock Rom or any custom ROM using Smart Phone Flash Tool (SP Flash Tool) on Windows Computer
Unzip download file
Load the included or your own scatter file.
Like select an(MT6575_Android_scatter_emmc)its not real
Click download and after that connect your phone to computer then insert battery.
Once the process completes, SP Flash Tool will show a green circle/tick mark.
It’s now safe to boot your phone.
Note:Make backup your phone before this process.