Backgrounds do not render about doublehelix-2 HOT 1 CLOSED

https://github.com/interdpth/DoubleHelix/blob/16a3c242d677b13419d1242d5fb53e2ab9c0bd4b/TilesetMananger.cpp

if (RoomHeader.lBg3 == 0x40) {
if (!currentRomType) fseek(GBA.ROM, RoomTilesets->gBackground - 0x8000000, SEEK_SET);
if (currentRomType) fseek(GBA.ROM, MFRoomTilesets->gBackground - 0x8000000, SEEK_SET);//Seek the compreGlobalVars::gblVars->SSEd Tileset
fread(&GBA.CompBuffer, sizeof(char), 32691, GBA.ROM);//Read compression
int size = GBA.LZ77UnComp(GBA.CompBuffer, decompbuf);
memcpy(&GBAGraphics::VRAM->BGBuf[0x7DE0 - size], &decompbuf[0], size);
}
for (int ii = 0; ii<512; ii++) GBAGraphics::VRAM->BGBuf[0x7DE0 + ii] = GBAGraphics::VRAM->fGbuf[0x600 + ii];

BGImage.Load(GBAGraphics::VRAM->BGBuf, 1024);

from doublehelix-2.