Hi, it's to reset your skills so you can place them again on what you like ( to unlock abilities, special guns or bounce damage etc.... ) when you reset reconnect to apply effects.
it was more fun to will new maps, protect each other back, fear of lose and we enjoyed more ( players need to start vote for new other maps they will have more fun )
did you place the file like that path ( Call of Duty / modsrotuv1 / do_not_delete / data.cfg ) ? bad internet can make you lose it again, make sure you following the steps and try again .