On this page, you will find the Download link of Zen X15 Firmware (flash file), which can be flashed on the device to fix it without the need of any other software.
Zen X15 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 Zen X15 Firmware is V1 and it was released on 06/06/2015.
File Name: Zen_X15_06062015.zip
Alternate Name: Zen X15 06062015
File Size: 4 MB
Released date: 06/06/2015