Default [Q] CWM is not working on my mobile

I have china's QMOBILE NOIR A50
NON ROOTED
Android version 4.1.1
Kernel version 3.4.0

CPU-Z Shows MTK6617
In Folder /System/etc/Firmware There is file
/MT6628_fm_rom.bin

I don't know which hardware or chip is in my mobile

when I open CWM BACK MANAGER it say
The Directory: mnt/shell/emulated/clockworkmod/backup doesn't Exist

I have installed this one if there is another one plz give me downloading Link.
play.google.com/store/apps/details?id=com.free.dennisg.cwmbackup&referrer=utm _source%3Dgoogle%26utm_medium%3Dorganic%26utm_term %3Dcwm+backup

THANKS