Can I downgrade the version of PGM Knights of Valour?

[zergadis]

I currently have Knights of Valour version 119, and I’d like to downgrade it to version 115. Is this possible? If so, could someone explain how to do it?

I want to play version 115, but I’ve bought three or four used cartridges, and they all turned out to be version 119.

The PCBs inside the cartridge are shown in the attached photos.

 

[GarouSP]

I'm not the best person to say this but, you can try to burn the 1.15 P0600 eprom, it's strange to me to see that this cart that you take those pictures don't have any eprom in p0600

 

[ShootTheCore]

Swapping the one ROM in p0600 that feeds code to the 68000 CPU is all you need to do - the rest of the ROMs are the same between KoV 115 and 119.