|The right way is to find what values are supposed to be in there. Lucky for you, a good start is usually available. Try the default or failsafe choice to return all values to the factory settings. It should be OK.|
You can not do any kind of roll back unless you saved that data to some paper or file.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.