This hack restores all the blood that was removed from the American version back to it, it also decensors the game's script a bit as well.
The 0xED hex editor was used to make this hack.
Mega Man Zero 2 (USA).gba
SHA-1: C4D93A58F0F82C526DEC8A3FDBDA170336303689
CRC32: CE1E37BB