[Q] Sky Vega lte EX IM-820L not recognized as Android Phone

I have Sky Vega IM-820L having problem is whenever I connected it through usb cable it shows only mass storage in computer and not recognized as Android Phone in windows 7 64b ultimate. Also in device manager no ADB Interface or Other device option shown only sky mass storage icon shown. I use some other Phone like Black Berry and HTC HD 2, and all of them shown correctly in device manager as android phone. But sky vega lte 4g IM-820L not recognized at all. I have update all the drivers like Pantch usb driver, IM-280L usb driver but all in vain.

Some one help in this regard will be highly appreciated.

Many Thanks.