Download and install MTK android USB drivers
Then download Firmware file/Flash file/Rom for your phone
Your phone must have 50 % charging before this process
switch off yourmobile remove the battery (if removable) reinsert the battery and plug the USB cable in charging socket
Now open SPflash tool.exe
When sp flash tool open, go to download button in sp flash tool
In download tab, click on scatter load button
After locating the scatter tab, click on the download button
Now connect your smartphone with press volume down and with a USB cable
Now flashing is completed, a green ring will appear in sp flash tool
Close sp flash tool on your computer and unplug phone
Power on the phone and enjoy
After flashing process starts and might take up to 5-10 minutes. So keep patience and wait.
flashtool : Download
firmware : Download