Until a proper fix is decided upon and implemented upstream, users should set the minimum frequency to 437500 Hz up from the default 300000 Hz in order to avoid a potential to hang on boot caused by firmware bug.
echo 437500 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq
This can be added to
/etc/rc.localso it executes automatically by editing that file directly or through LuCI:System → Startup → Local Startup
-https://openwrt.org/toh/linksys/e8450#preventing_the_potential_of_hangs_on_rebooting