Hey all, I just bought my smoktech vmax from a store yesterday and when i brought it home, i set the settings to show the atomizer resistance when im vaping. The 3 functions are "DO" "DU" or "DR", DR = atomizer resistance, DU = battery voltage, and DO = atomizer output voltage while vaping. After i set it to the DR to show the resistance, i can't seem to change it back, i watched many youtube videos about the vmax and all of them can do it except me ?! I don't know if my pen is broken or what. Also if it is, can the store i bought it from be able to replace it? They have a sign up that says no refunds but i'm not sure about exchanges, like a broken one for a working one. Sorry if i got anything wrong BTW! i'm sorta a newbie