I just updated my P3A controller and now the anti flicker setting is set to 50hz and will not allow me to set to 60hz.  Because I live in the U.S., 50hz will probably not help.  Has anyone else had this problem and if so, resolved it?

You need to be connected to the P3 . It won't work if only the App is open , neither the App and the remote .

I was connected, all other controls and settings were operating properly.  The only setting I was unable to adjust was the anti flicker.  It would not go into auto or 60hz.

My P3 too. Can't change auto or 60Hz, but I change shutter speed to 1/50 make stop flicker, instead of shutter speed 1/60.