Error: Unsupported cartridge about gba_multimenu HOT 4 OPEN

Maybe I haven't understood it correctly and they only work on cartridges like the 369 in 1, which already have the multimenu option?

from gba_multimenu.

I'm getting the same error just trying to run the rom in an emulator. Doesn't seem to matter which roms I use.

from gba_multimenu.

But the multirom does not work on emulators, it has to be recorded on cartridges.

from gba_multimenu.

I am having the same problem, did you solve the problem? I know mGBA doesnt support it but when I create the rom it opens and I see both roms (I have put) and when I try to lunch any of them I got the unsupported message. But if I flash to the cartridge I get white screen (I suppose my cartridge doesnt support this kind of multi boot).

But if I put the generated rom in the EZ-Flash I get the same problem as mGBA. My conclusion is, in EZ and mGBA show the unsupported message because they are emulators and my cartridge white screen because isnt compatible?

from gba_multimenu.