1ª) Create a URF mode 2x2, you must be 1ª player in red team.
2ª) Make Free kill, killing the players of Blue Team.
3ª) After Freekill, create a BD room and spam F5 buttom until error UDP ports appear, close the UDP message and enter in shop, press ESC to return to main BD screen and do it again. (Repeat this process 5 times)
4ª) After done 5 times the 2ª step, Get out of channel and re-enter in any channel, so, repeat 2ª step.
Note 1: Before do 1ª step make sure that you spam F5 buttom the UDP message is showed to you, if not you are unable to do mastery bug.
Note 2: FreeKill need do 1 only time.
Note 3: You cannot enter inside of match after freekill, if you enter you need do frekill again.