I recently noticed the in call volume is very low, the speaker volume is fine. I am rooted but stock rom with no other mods. If I unroot with toolbox and do a factory reset, will that erase all traces of root so that I can return the phone to VZ? or maybe by doing a factory reset it will fix the problem. Also if I install safestrap and do a backup will the factory reset erace all traces of it to return it?