Punkbuster GUID help

So one of my friends asked me to how to change punkbuster GUID, i dunno why but is there someone here that might know, wud really help him out alot, and me cause its for BF3 and he cant play on some servers but he got a tip that changing Punkbuster guid or something might help him to be able to play on all cinda servers any tips wud help alot

If I remember right PB will use the BF3 cd key as the GUID. Try loading up the game, Minimizing to desktop, and changing the BF3 cd key via regedit. (Make sure you back up the original CD Key as you will need it to run the game after you exit!)