ROM Hack [Question] Black Screen on Modded .cia?

[NekoMichi]

I've built a modded version of Pokémon Sun but when I try to launch it, it just stays on a black screen. Does anyone know what could be causing it?

The only modifications I have made are to the icon, banner, and unique ID.

Console: N2DS XL
Firmware: 11.5 (B9S/Luma3DS 8.1.1)

The exact steps I used are as follows:
1. Dumped Pokémon Sun from cart to .cia with Decrypt9
2. Extracted contents with HackingToolkit3DS
3. Used Ohana3DS to replace textures in extracted banner
4. Used HackingToolkit3DS to rebuild banner.bin, overwrote original banner.bin in ExtractedExefs folder
5. Used EveryFileExplorer to replace icon graphics in icon.bin
6. Used hex editor to change title from "Pokémon Sun" to "Pokémon Stars" for all European languages in icon.bin (using overwrite mode to prevent changing file size)
7. Used hex editor to change unique ID from 0004000000164800 to 0004000000ABE200 in DecryptedExHeader.bin and HeaderNCCH.bin
8. Rebuilt .cia file with HackingToolkit3DS
9. Installed .cia file with FBI (2.4.11)

The .cia file's attributes in FBI look like this:

The icon and banner all show up correctly on the Home Menu:

But when launched, the console will display the 3DS logo before stalling on a black screen.

 

[KunoichiZ]

IIRC, you cannot change the Title/Unique ID of any of the 3DS Pokemon games otherwise they refuse to work. Try changing the Title ID back to what it was then try again.

Also, I like the changes that you made to the game's assets.

 

[NekoMichi]

IIRC, you cannot change the Title/Unique ID of any of the 3DS Pokemon games otherwise they refuse to work. Try changing the Title ID back to what it was then try again.

I... am an idiot. Just looked back at the title ID changing tutorial and it said right there that Pokémon games won't work. Somehow managed to miss that.

 

[KunoichiZ]

I... am an idiot. Just looked back at the title ID changing tutorial and it said right there that Pokémon games won't work. Somehow managed to miss that.

Hey, it happens to the best of us. Trust me, I would've tried to do the same thing.

 

[NekoMichi]

Hey, it happens to the best of us. Trust me, I would've tried to do the same thing.

Turns out it's just the main series Pokémon games. I tried the same with Pokémon Link Battle and it worked instantly.
Thanks for the heads-up

 

[KunoichiZ]

Turns out it's just the main series Pokémon games. I tried the same with Pokémon Link Battle and it worked instantly.
Thanks for the heads-up

You're welcome! Did they mention why it doesn't work on the main series games, by any chance?

 

[NekoMichi]

You're welcome! Did they mention why it doesn't work on the main series games, by any chance?

According to this tutorial, it's because of a plainrgn.bin file. It seems to be related to listing information about the SDK used to build the game, but I'm not sure why that would affect the game launching.

 

[adrifcastr]

Could you maybe provide the icon and banner you made? looks neat actually

 

[NekoMichi]

Could you maybe provide the icon and banner you made? looks neat actually

I can upload the icon.bin since it's entirely mine, but I can't upload the banner.bin because it uses model files from the official Pokémon Sun banner, which is copyrighted.

 

[MrPlix]

hey!
looks like a cool mod...
i really wish I could play it on my 3ds!
Is the mod/fangame public, or just for you?

Post automatically merged: Jan 2, 2023

also I bet if i did a pokemon sun mod I'd make the same mistake