hello i can't afford a subscription to the website, i really need help. My mouse is really messed up i was playing 900dpi and 6 sens in overwatch but my recently my dpi button broke and i switch between 400 and 900 in desktop and game. i can't switch back to 900 dpi, its an old mouse its the logitech mx518. i tried looking for software and downloaded but it didn't work. i really cant afford a new mouse im only 12 years old and i really want to convert my sensitivity. what im trying to do is my overwatch sensitivity 900dpi 6ingame to 400 dpi and that sensitivity is what i need. if someone could really help that would be lovely. thank you.