@elcaset Yes, use the installer but make sure you tick the option to wipe data to remove all your friends stuff. As was mentioned above you don't need to reload the stock android for your device if it already has UT on it.
Sometimes things go a bit.'off' with UT and you may notice some 'strange behaviour'. Quite often a reinstall without the wipe option cures the problem.... and maintains your precious data.
Welcome to the wonderful world of UT. Enjoy☺