The deep irony is that the official, comprehensive manual for the ZTE F670 is either non-existent, deliberately obfuscated, or deeply disappointing. A typical search yields:
Found in the "Security" section to restrict internet access for specific devices at certain times. Port Forwarding: zte f670 manual
If you need advanced QoS, VPN server, or mesh Wi-Fi, put the F670 in bridge mode and buy a separate router. If you just need internet, Netflix, and Zoom – the F670 is perfectly capable. The deep irony is that the official, comprehensive
Change the default password immediately. Brute-force scripts continuously scan for factory default credentials on the public internet. or mesh Wi-Fi