ROM Hack [Development] How do i inject gba roms?

[AquaX101]

How do we inject gba roms into ambassador roms? I've found where the rom is, but when i replace it and turn it into a cia, i get the nintendo 3ds loading screen.

 

[Zidapi]

Have you compared the Ambassador ROM to the retail dump?

You might find the answer you seek there. Perhaps it's looking for a modified header.

 

[AquaX101]

Have you compared the Ambassador ROM to the retail dump?

You might find the answer you seek there. Perhaps it's looking for a modified header.

hmm, i'll check that. But the rom is a code.bin you can open up in VBA, i don't think its anything special.

 

[bobmcjr]

Have you gotten unmodified Ambassador games working?
The Ambassador code.bin's are identical to scene dumps. I tried making a modified GBA cia, but it said the sd card was removed whenever I tried to boot it in Pasta.
AGB_FIRM has signature checks, so I guess that should be expected. I'm pretty sure patching AGB_FIRM is the first step here, but I have no idea how.

 

[AquaX101]

Have you gotten unmodified Ambassador games working?
The Ambassador code.bin's are identical to scene dumps. I tried making a modified GBA cia, but it said the sd card was removed whenever I tried to boot it in Pasta.
AGB_FIRM has signature checks, so I guess that should be expected. I'm pretty sure patching AGB_FIRM is the first step here, but I have no idea how.

no, but if you edit in the rsf so that it doesn't compress the code.bin, it should work with unmodified ambassador games. Tried it with a different rom with the same size (16 MB) and it would leave me stuck on the "Nintendo 3DS" loading screen.

 

[bobmcjr]

It sounds like you're trying to run a GBA game through Gateway or something (which doesn't work), because working Ambassador games never show the Nintendo 3DS loading screen. They just fade to black when they're launched.

 

[Zidapi]

It sounds like you're trying to run a GBA game through Gateway or something (which doesn't work), because working Ambassador games never show the Nintendo 3DS loading screen. They just fade to black when they're launched.

I just assumed he was attempting it under PASTA, since everyone knows it won't run under gateway mode.

 

[AquaX101]

It sounds like you're trying to run a GBA game through Gateway or something (which doesn't work), because working Ambassador games never show the Nintendo 3DS loading screen. They just fade to black when they're launched.

Nonono, i am using pasta (CFW) and regular ambassador games work fine through it, i get the 3ds loading screen when i replace the gba rom with something else

 

[bobmcjr]

I still feel like your CIA isn't compiled right, as your 3ds doesn't appear to be recognizing it as a GBA game. It really should fade to black and not show the Nintendo 3DS loading screen. My broken GBA inject fades to black before saying the SD card was removed.

 

[Zidapi]

@AquaX101 i happened across this in another thread. Not good news I'm afraid.

AGB_FIRM has sig checks. You can inject your own GBA rom, but it probably won't ever run. I don't know about a modified GBA VC CIA with region free icon though. I think AGB_FIRM only checks the code.bin file. But not sure how exactly that works. CitrAGB will probably run near full speed anyway once a CIA build of it is available.

 

[piratesephiroth]

Nonono, i am using pasta (CFW) and regular ambassador games work fine through it, i get the 3ds loading screen when i replace the gba rom with something else

AGB_FIRM seems to have the very same signature checks used for regular 3DS games. It demands retail-encrypted CXIs with valid signatures and no public patch has been disclosed (if it ever existed).

 

[Zidapi]

@AquaX101 Scratch everything I said earlier, it's already been achieved by @Riku. It needs a particular footer, not header apparently.

Yo, I heard you guys like Ambassador and GBA games, so I put some GBA games into Ambassador games:

didn't know that, thanks, 32MB roms works fine.

Spoiler

Don't decompress the .code, it's not compressed. The .code is the rom followed by a footer.