Download Sansui S66 Flash file
Install SPD Driver
1- Download the package & Extract Sansui S66 Flash tool.
2- Out of the icon appearing, Double click on UpgradeDownload.exe.
3- It will Launch the tool on PC.
4- Click on Load Packed button & Select the Firmware with extension .pac at end.
5- Click on Downloading button which is at third position.
6- Switch off your Mobile & connect it to PC using Volume down key.
7- It will lead you to Successful flashing.