What people call “extra quality firmware” is often:

It looks like you're trying to find a for the ZTE H196A router (often used by ISPs like Telmex in Latin America), specifically seeking something labeled with terms like "extra quality" —which suggests you might be looking for an unlocked, modded, or improved firmware version.

“Extra quality” in this context could mean:

: The router continuously scans for congested Wi-Fi channels (especially in the crowded 2.4 GHz band) and silently switches the entire mesh network to the cleanest available frequency without dropping active connections . Implementation & Maintenance