Changing default ringtone configuration

Jan 22, 2014
Hello everyone.

I have one question:
I want to change the default ringtone on my own. I know that in the AOSP, for example, we can change the values in build.prop, but it does not work on MIUI. I changed the value on my own, but when I installed the ROM, ringtone remained the same as the default.
Does anyone know where I can find these config/values?

Thank you.