No idea but the Free Flight board manages Autolevel very well, let go of sticks and it is pretty solid no wobbling around or going erratic like some have found with KK2.
That's not a KK board problem. It's a setup problem. So many things can be setup wrong that will cause such issues. The KK2 is working well for many, many users so deductive reasoning points to different things than the KK2 board as a cause for unwanted flight characteristics. If it was a coding problem, or lack of, then every pilot would have the same issues. Not only "some" pilots.