so hans bascily swaps romsf and code which is most of the the rom the reason why it can't swap roms i think is because the header needs to be taken off the romsf in order for it to work and their are some other files in their two if you made some thing that replaced the whole rom it could be possible to swap roms maybe. Im not telling you that it would be easy to do this im just saying it looks possible to me to swap roms or that it is possible its just looks possible to me.