Whenever I changed the settings, I always save it on another profile in the "program save" menu either on S.P 1 up to S.P 4. According to the manual on page 25.....Program save (only for Zero V Ext)...
When in save display mode, PRESS the left AND right together. LED(7) starts blinking. After that, set the number of the program you wish to save by using either the left or right button. Then press the left AND right buttons together for 4 seconds. When the program loading is complete. "END" will be displayed.....Your DONE !!!!!!!!!!!!!

Happy Racing

Henry E.