Most users should rely on automatic updates. The ISP pushes the latest stable version directly to the device to ensure compatibility with their specific fiber network. You can check if this is active in the settings: Log in to the web interface (usually at 192.168.1.1). Navigate to Management & Diagnosis > Firmware Upgrade . Check for "Auto-update" or "Cloud update" options.
Locate the "System Management" or "Software Upgrade" section. Upload and Flash: zte f671y firmware update portable