People say no but when I change my browser adress on my autotune S9 from http://192.168.1.102/cgi-bin/minerConfiguration.cgi to http://192.168.1.102/cgi-bin/minerAdvanced.cgi  I do get a secret page where I can change my frequency.

In case I want to underclock I would not worry too much and could try the 550 setting..

But If I would like to overclock to 675 frequency, and I don't like the heat and noise it creates, how do I change it back to the original autotune setting?

Anyone tried to overclock using this trick of the hidden advanced page , and how did it work out ? And how did you get back to the autotune mode?