Thank you. Yes I did the factory reset but to no success. All my Flash Drives are FAT 32. The Dongles are Huawei EC152 (Tata Photon+) and ZTE 3G dongle (Reliance 3G).
The thing is the microSD slot in the tablet detects the microSD card. But if I put the same card in any of the dongles' MicroSD slot it doesn't detect at all. Says "USB device has been unmounted". Do you think there's a problem with the USB port? But again the mice that came with it works fine.