Permission On .framework, how can we have permission to replace em Options

[eaks]

Hi, I need to switch my Coreaudio.framework (in system folder/frameworks) for another one...
I tried many ways such as booting in various mode but I cant seem to have the permission to replace this with a new one. Any suggestions?

thanks!

[eaks]

Well, after I tried everything I thought would make it work and still it wouldnt work, I found a text where a solution for my exact problem was written. It is said in this text that I have to replace the latest coreaudio.framework with the previous version. So that's what I tried. Apparently it worked for some but maybe it was before the arrival of dual processor machines...