USB settings

Hi. I am trying to unlock more LTE basebands on my Meizu mx4 PRO, and early in the prosess i am getting stuck because i have to change the USB from AP to CP. And to do that i have to enter a hidden USB Settings menu, wich normally is a code *#0808# in the dailer, but not on meizu,
So is there somone out there that knows how to enter this menu on a Meizu phone?

Thanks alot in advance :)