I searched google and stumbled upon this: https://github.com/johnson442/custom-zyxel-firmware/releasesAnyone tried these yet?
I see that ZyXel haven't issued any new firmware for this model since Jan 2019 - do we think it's getting too old and there won't be any more updates now?
I don't think we'll see any more updates but things seem stable enough as is.
The only issue I occasionally have with mine is that 2.4GHz Wi-Fi will stop accepting connections but typically the 5GHz will still continue to work which then necessitates a reboot but this is normally after 3-6 months. Admittedly I use it router only as my old HG612 is still going strong.
Would this help? https://forum.kitz.co.uk/index.php/topic,25101.0.html