From the official Asus site, Version 9.0.0.4.386.41994 beta is "Please be noted this is a quick fix beta version for DNSmasq vulnerabilities." No mention whatsoever about the overheating issue of the RT-AC86U router.
AC86U overheats with fw 386
I assume the CPU is getting hotter because it is doing more processing, has there been any definitive explanation of what extra processing is taking place, especially if Trend Micro is disabled? I disabled everything to bring the temperature down and CPU was idling most of the time but that...
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