I'm not sure what you guys are doing, but this solution definitely works and has been done by hundreds of people successfully.
My guess is that you don't have the proper root permissions to change the file name (it's a system file). Do it using ES File Explorer. Go into the ES File Explorer settings, go into the Root Settings, and check all of the boxes. Then rename the file. It works on CleanRom 5, I am 100% positive of that.
I have no yet flashed CleanRom5.5, but I am 99% positive this same solution will work on that as well.