0.0) Download my PackHack and extract it.
0.1) A banner already created (How to create a custom 3D banner is not the purpose of this tutorial).
1) Build your GBA in CIA as usually.
2) Once you have your CIA, put it in the same folder as HackingToolkit.
3) Run it, write CIA then press enter, and when you are asked for a name, enter the name of the CIA you just created (without .cia).
4) When asked for, DO NOT DECOMPRESS THE CODE.BIN FILE!
5) You should see some new folders (exe / romfs / DecryptedBanner). You can delete the DecryptedBanner folder, it is not useful here.
6) Go in the exe folder, delete the banner.bin file, and replace it by your own. Do it for icon.bin too if you want.
7) Now you are ready to rebuild your game.
8) Always as usually, then convert your new .3ds to .cia using 3DS Simple CIA Converter.
Screenshots for Proof:
http://image.noelshack.com/fichiers/2016/03/1453294510-1.png
http://image.noelshack.com/fichiers/2016/03/1453294506-2.png
http://image.noelshack.com/fichiers/2016/03/1453294510-3.png
http://image.noelshack.com/fichiers/2016/03/1453294510-4.png
http://image.noelshack.com/fichiers/2016/03/1453294511-5.png
http://image.noelshack.com/fichiers/2016/03/1453294957-6.png
http://image.noelshack.com/fichiers/2016/03/1453294952-7.png
http://image.noelshack.com/fichiers/2016/03/1453294951-8.png
http://image.noelshack.com/fichiers/2016/03/1453294953-9.png
http://image.noelshack.com/fichiers/2016/03/1453294955-10.png
0.1) A banner already created (How to create a custom 3D banner is not the purpose of this tutorial).
1) Build your GBA in CIA as usually.
2) Once you have your CIA, put it in the same folder as HackingToolkit.
3) Run it, write CIA then press enter, and when you are asked for a name, enter the name of the CIA you just created (without .cia).
4) When asked for, DO NOT DECOMPRESS THE CODE.BIN FILE!
5) You should see some new folders (exe / romfs / DecryptedBanner). You can delete the DecryptedBanner folder, it is not useful here.
6) Go in the exe folder, delete the banner.bin file, and replace it by your own. Do it for icon.bin too if you want.
7) Now you are ready to rebuild your game.
8) Always as usually, then convert your new .3ds to .cia using 3DS Simple CIA Converter.
Screenshots for Proof:
http://image.noelshack.com/fichiers/2016/03/1453294510-1.png
http://image.noelshack.com/fichiers/2016/03/1453294506-2.png
http://image.noelshack.com/fichiers/2016/03/1453294510-3.png
http://image.noelshack.com/fichiers/2016/03/1453294510-4.png
http://image.noelshack.com/fichiers/2016/03/1453294511-5.png
http://image.noelshack.com/fichiers/2016/03/1453294957-6.png
http://image.noelshack.com/fichiers/2016/03/1453294952-7.png
http://image.noelshack.com/fichiers/2016/03/1453294951-8.png
http://image.noelshack.com/fichiers/2016/03/1453294953-9.png
http://image.noelshack.com/fichiers/2016/03/1453294955-10.png