Some versions have a "Check for Update" button. If available, click it to let the router pull the latest version from the ZTE or ISP servers automatically. Local Upgrade: If you have a specific firmware file (usually ending in ), you will need to: Choose File Select the firmware file from your computer. Insation Technologies 4. Critical Safety Precautions Official Sources Only:
Common issues resolved in later firmwares: Zte F670 Firmware Update