Change games and flash old Konami Compilation Vol. 2

Hi. I have a RBSC Multimapper with 2Mb and flashed @gdx modified rom into it, and works flawlessly.

Using hex edit, found 16k with loader flashed 2 times, and all 16k-32k roms that can replace without problems, but if i try to replace maze of galious, game don´t boot, and If i try to replace last megarom, penguin adventure, all roms stop work.

Maybe a protection into loader? Is possible to add more games to complete 2Mb RBSC flashcart instead "only" 512kb?

Thanks in advance