A tutorial with a problem I was having a day before when two of my quads were having arming issues after flashing Betaflight. It was simple come towards the end after watching a hundred you tube videos and seemed to work and noticed power gain back to my motors. A slight side effect however you may have to tune your PID's a little bit. Side effect wasn't bad though, I just trimmed up alil bit on the controller, can go the extra length and adjust the trim in your controller for more permanent solution. But this will definatly get you back in the air.
