Download Masstel M421 Flash File:
How to Flash Masstel M421:
Install MTK Driver.
1- Download the package & Extract SP Flash tool.
2- Out of the icon appearing, Double click on Flash_tool.exe
3- it will launch the tool on your PC, Click on Scatter-Loading appearing on the Right side of the tool.
4- Now, assign the firmware which will be in form “Android_scatter.txt”.
5- Click on Download to start flashing.
6- Switch off your Mobile and Connect it to PC by pressing Volume down & Volume up keys if it fails then connect without pressing any key in off mode.
7- It will lead you to Successful Flashing