Normaly, you dont need to sudo gainroot !
Before Re-flash, i save lot of scripts i have, and i only have, for example:

sudo echo 500000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

And now, it just gives me permission dennied :S

I dont know much of linux commands but..nothing related do chmod ?! :S

Helppp, i just reflash my phone and now it's 'closed' to my commands :S