On this page, you will find the Download link of Sansui M12 Firmware (flash file), which can be flashed on the device to fix it without the need of any other software.
Sansui M12 Firmware comes as a zip file and is of 4 MB in size. Firstly, You need to extract the zip file on your computer and flash it using the flashtool.
The file version of Sansui M12 Firmware is V1.3 and it was released on 25/08/2015.
File Name: Sansui_M12_V1.3_25082015.zip
Alternate Name: Sansui M12 V1.3 25082015
File Size: 4 MB
Released date: 25/08/2015