Trying hack Sonic Battle

Hello to all, I'm Ceres.

Some weeks ago, I'm trying to hack Sonic Battle (Not palettes, but arenas textures, characters sprites, musics), but I'm having much problems:

1. Sappy don't works in Sonic Battle.

I tried open Sonic Battle in Sappy, but don't works. The only thing that i got is: This Rom [BSBE] is unsupported by this version of Sappy. (And this is the last version)

2. Tile Layer Pro don't find the graphics properly

When I open Sonic Battle in TLP, I don't find the sprites, arenas or other graphics. And yes, I discovered the offset of the sprites and arenas, but, I don't have idea how I edit this graphics.

3. Lack of information

I looked in Google numerous times, but nothing. "How to hack gba ROMs" "Sonic Battle hack" "Sonic Battle Edit", I tried numerous things, but nothing.

Anyone can help me, please? Anything will help.

Thanks.

Graphics are probably compressed so jump over to the Utilities section and search for unlz-gba or GBA Multi decompressor or NLZ-GBA.

Yeah, I found the sprites in Unlz-gba, now I can edit them! thanks!

I'll look in utilities for programs, if has any program to edit music.