Guys iam facing a very weird problem , one of my esc in my quad Is giving me a real hard time . I am using a kk 2.1.5 boatd with emax 30A simonk esc , they are connected to genuine sunny sky 2212 motors . When i had finished with the setup of my kk board i went on to start it up , 3 of my esc (m1 M2 m3) gave the usual chimes and calibrated themselves . The m4 esc (rudder or yaw) did not . It started its chime a bit late  , it stares spinning on its own when I exited the menu . This is my first quad build and iam a bit puzzled as to what to do . I am attaching a video of the same problem that iam having . Please be kind enough to refer to it and help me with my problem.

I'm having the same problem. Did you get solve this problem?