The firmware feature requires backend support:
Manufacturers typically support a given firmware branch for 18–24 months. P639 was released in April 2024, so critical security updates will continue until at least Q4 2025. hktrt2843p639 firmware
For developers and security researchers, analysis of this firmware can reveal backdoors or improve open-source drivers. hktrt2843p639 firmware
Add this to /etc/sysctl.conf to persist after reboot. hktrt2843p639 firmware
A: Yes. Most consumer firmwares perform a full NVRAM reset. Back up your settings externally before updating.