Sp Flash Tool Is Used To?
Flash Stock firmware, custom firmware, kernels intoMediatek powered devices. This utility tool is useful in situations where you want to unbrick your bricked smartphone.
It can be used to reset your mobile.
Also, this application is used for Advanced memory testing and for verification.
On the other hand, it can be used to read or write parameters.
This tool can be used for formatting, erasing and also to Reset mtk based smartphones and tablet devices.

How To Use SP Flash Tool
Use the step guide to flash your mobile using Sp flash tool V5.1828, the latest version for Windows.
Step 1: You have to install USB drivers if you haven't installed them in your PC.
Step 2: Now power off your mobile and remove the battery if it is possible.
Step 3: Download and extract the zip file of Stock or the Custom Rom file into your PC.
Step 4: Download SP flash tool zip file into your Windows PC. Extract it onto your PC.
Step 5: Find and open the flash_tool.exe from the above-extracted folder.
Step 6: Now launch the SP flash tool.
Step 7: Find the download tab and click on it.
Step 8: In that download window you will find two options named as Download Agent and Scatter-loading. Just click on the scatter loading option.
Step 9: Now locate the scatter which is located in scatter file folder in the stock ROM folder.
Step 10: Then you have to click on the Green color down headed Download button in order to begin the flash procedure.
Step 11: Connect your mobile to the PC (without the battery Only if removable.) Once you connect your mobile to the PC, press volume down or the volume up key in order to detect your mobile easily...
Then the flashing procedure will begin and a green color will appear once the flashing is succeeded. Now you are free to close the Application and disconnect your mobile from the PC. That is all and your smartphone is now running the Stock ROM which you wish to Flash into your mobile.
Source:https://spflashtool.com/