itz workin. Just because you never see the rank up symbol doesnt mean your mastery never rank upi by percentage. What im trying to say is that you should take a screenshot before you enter the BD match, then after the BD match , you take another screenshot of your mastery . Now you can cross reference the two mastery and see if it increase a not. Make sure you finish the BD match and not leave half way , if you leave half way then the mastery wouldnt be save . Hope this helps most of the problem that people keep complaining abt the mastery hack not working
U sure ?
I played until the game ends still it just increase by 2%