I've just flashed the bios and it goes from 10.5MHs to 12.5MHs, but, i can't modify core and memory clocks with afterburner.
The BIOS I've made by myself with other settings I was getting about 13.5 MHs, but I was running 1300/1950 and this rom is 1150/1875 but without the option of changing those values.

I'm doing something wrong or did you fix them?

Thanks mate!