How to underclock telus fascinate to 600MHZ?

[MysticD]

My fascinate is rooted runm not givening DarkyRom 10.2 Ressurection Edition...I am trying to underclock to 600MHZ using SetCPU but I am not able to select 600MHZ as my frequency, but I can select 400MHZ and 800 MHZ...Does anyone have any ideas or even another method of underclocking? Thanks