How to setup a custom DNS on your TIM ZTE H388X router

custom.router.md

To setup a custom DNS on your TIM ZTE H388X router:

• head to "Rete Locale" -> "LAN" -> Server DHCP
• execute this script in the browser dev tools console

document.querySelectorAll('#template_DHCPBasicCfg [style*="display: none;"]').forEach(el => {
    el.style.display = ''; // Removes inline display:none
});

• you should see

• set your preferred DNS
• save

Ottimo quello che stavo cercando.

Grazie per lo script, funziona perfettamente!

THANK YOU, I LOVE YOU, I SEARCHED EVERYWHERE FOR THIS

Funziona alla perfezione, grazie mille

Thank you man, I was about to smash the router with an hammer

Fantastic

Thank you!
I managed to unlock the hidden DNS fields on the TIM ZTE H388X using the script posted above.

The fields appear and I can save them successfully:

• Primary DNS = 192.168.1.5 (AdGuard Home running on Home Assistant)
• Secondary DNS = 1.1.1.1
• ISP DNS = OFF

AdGuard does receive queries, but the router rewrites all hostnames by appending the local suffix .homenet.telecomitalia.it, so lookups fail and resolve to 127.0.0.1.

Do you know if there’s any way to disable this hostname rewriting (the homenet.telecomitalia.it suffix), or to make the router forward DNS queries exactly as received to AdGuard?
Alternatively, is there any hidden setting or API endpoint to disable the internal DNS proxy altogether?

Thanks in advance!