It seems to have happened,the guys who brought out jalbreak have now released the downgrader,from what i gather,you will utilise the jailbreak with some new files to downgrade then delete the files and revert back to the jailbreak,you only get to use the files once
They realy are looking for the almighty $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$