Karbonn Sparkle V - Tethering NOT working after update Android 6.0 Marshmallow

After update my Karbonn Sparkle V device to Android 6 Marshmallow, tethering is not working.

I have also set "tether_dun_required" to "0" in setting via ADB command. But not success.

If anybody having same problem after update to marshmallow? And have any solution for that?
I prefer solution which work without rooting. Also welcome solutions with rooting.

Karbonn Sparkle V soft Brick need Help

Please can any one help me ,my karbonn sparkle v running on android 6.0 (marshmallow ) has soft bricked as i think so it is not starting up this is due to i tried it to root .
please give help as soon as possible