"Custom PTCL" means it is carrier-branded. V2.1 is relatively recent. Check the date code – if it is older than 2022, consider updating.
If you’ve confirmed your firmware is up-to-date but still face issues: Ptcl Zte Zxhn H168n Firmware
Ahmed connected the device. It hummed to life, a low-frequency vibration that only he seemed to hear. He connected his laptop via Ethernet, bypassing the chaotic noise of the Wi-Fi spectrum. He typed the familiar mantra into the browser bar: 192.168.1.1 . "Custom PTCL" means it is carrier-branded
End.
POST /cgi-bin/ping_test.cgi HTTP/1.1 Host: 192.168.1.1 Content-Type: application/x-www-form-urlencoded Ptcl Zte Zxhn H168n Firmware