If the "Software Update" tab is missing or greyed out (common on ISP-locked units), you may need to access the or use a tool like TFTP .
Upgrading your firmware can unlock better stability, patch security vulnerabilities, and sometimes even improve Wi-Fi range and throughput. Here is a comprehensive guide on how to perform a firmware upgrade on your ZTE F670L. 1. Why Upgrade Your ZTE F670L Firmware? zte f670l upgrade firmware portable