Herelink button channel sharing

I have a ground vehicle application where I use the Herelink A button (default value 1500, active value 1000) to drive a motor one direction, and the C button (default value 1500, active value 2000) to drive the same motor the opposite direction by sharing the same channel. I made a second robot to have the same functionality and when I did the automatic update on the 2nd controller and now the option of having two buttons on the same channel gives an error "Invalid Config, Cannot share Toggle/Momentary Button A_short_press with C_short_press. The other buttons are in use and having them be momentary is important.

Would the current beta firmware enable this functionality?

Can I download older firmware?

Is is possible to copy firmware from one controller to another?

Thanks for the help!