Hello previous i was used TP-LINK TL-MR3420 3G/4G Wireless N Router (Not a Modem) but i work airtel wifi and after i was given to my friend he is using after that i orded this router TL-MR3620 for 5gHZ Band and bougt Airtel 4G LTE Hotspot Binatone Portable WiFi Data Card via usb tethering and connected to 3g/4g device but when vofi is not working is there any update will come for this device or not