iv looked
IIRC There are only 4 differetnt bi-roms across all of the mega System 1 games so there is always a good chance that it wont have to be swapped.I didn't had to change the birom, fortunatly.
It was a real pain in the ass try founding a Big Striker pcb, they are almost impossible to find
Indeed , tried and this is what i got (anyway , here i placed wrong the eeproms thats why it looks like this and i understood what you mean -> the game with bog striker bprom is playable , is almost 100%) :Using the big striker prom on cybattler just had some of the background objects blocking your view but otherwise fully playable.