On this page, you will find the Download link of Symphony D22 Firmware (flash file), which can be flashed on the device to fix it without the need of any other software.
Symphony D22 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 D22 Firmware is V4 and it was released on 2017/08/01.
File Name: Symphony_D22_PCB01_MT6261_S00.D22_HW1_V4.zip
Alternate Name: Symphony D22 PCB01 MT6261 S00.D22 HW1 V4
File Size: 3 MB
Developer: Symphony Mobile Inc
Released date: 2017/08/01