: Access advanced VoIP settings or frequency band selection.
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Before flashing, verify that your device matches the exact hardware profile of the B311-221 variant. Specification 4G LTE Wireless Router LTE Category Category 4 (Up to 150 Mbps download) Supported Bands B1, B3, B7, B8, B20, B38 Wi-Fi Protocol 802.11b/g/n (2.4 GHz) Ports 1x GE LAN/WAN, 1x RJ11 Phone Port Prerequisites Before Flashing : Access advanced VoIP settings or frequency band selection