On this page, you will find the Download link of Symphony D31 Firmware (flash file), which can be flashed on the device to fix it without the need of any other software.
Symphony D31 Firmware comes as a zip file and is of 3 MB in size. Firstly, You need to extract the zip file on your computer and flash it using the flashtool.
The file version of Symphony D31 Firmware is v1 and it was released on 04/10/2016.
File Name: Symphony_D31_08082013.zip
Alternate Name: Symphony D31 08082013
File Size: 3 MB
Released date: 04/10/2016