Other way, but I get same symptoms. Web GUI wasn't start after firmware flashing. Telnet on 192.168.1.1 was still accesible and I decided to clear nvram, giving commands:
....
nvram erase
nvam commit
reboot
(did it several times before in same situations)
....
and get "reboot cycle hell". Now...
You are quite right! Just apply she same clocks on my device, and it's normally starts.
667MHz i tried before reverts clock to default at boot time.
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cat /proc/dmu/temperature (cpu : idle)
[800, 533] - 72C
[1000,666] - 73C
room - 25C