After a long time I Found a Solution for mtk Users to solve the problem.
This method is easy as any other methods..
What you need to perform the methods..??
1. A Rooted MTK device
2. Root Explorer.apk
3. Wifi Error Fix.rar
How to do this?
On Your Rooted device go to root Explorer
And navigate to File system root/
There you will found to files named 1) WIFI , 2) WIFI_CUSTOM just simply delete these files
Now extract the files from the WiFi fix.rar
and move the extracted files to the previous (root/
After this process complete You need to just reboot your device. Now go to the wifi adapter setting and you will find the message of NVRAM Error Warning is gone...
I tested this on my Micromax A89 Ninja(Mt6577).
If I helped you all just say thanks by hit the Thanks Button...