Always check with your ISP first. They control which firmware is compatible.
Perform a factory reset and re-upload your saved configuration file to clear out old cache.
Ensure your router remains powered on throughout the process; a power loss during an upgrade can cause permanent hardware failure. Login Credentials: Access requires the administrator IP (default: 192.168.100.1 ) and credentials (often telecomadmin admintelecom Method 1: Automatic Online Upgrade