getting fruitbox v2 to load from boot on rpi 4 8gb

[deed1001]

hi all i have an arcade machine with a raspberry pi 3b+ with a ribbon cable to a 2in1 micro sd card switch so i can switch from arcade games to fruitbox now that setup runs great now i have a pi 4 8gb version and want to run fruitbox the same at min fruitbox works from terminal within os but i want to get it to launch from boot like the pi 3b version anyone no what the command i need to add to get that working thanx any help appreciated