Problem with Fading in unity for N3DS (Any N3DS Developer)

Hi, i have problems with fading on 3DS hardware, i now there are forums for nintendo consoles but nobody answers me there, besides it's nothing confidential, so i have the next code:

Code (CSharp):

1.  
2.  
3. void OnGUI(){
4.  
5.         alpha += fadeDir * fadeSpeed * Time.deltaTime;
6.  
7.         alpha = Mathf.Clamp01 (alpha);
8.  
9.         GUI.color = new Color (GUI.color.r, GUI.color.g, GUI.color.b, alpha);
10.  
11.         GUI.depth = drawDepth;
12.  
13.         GUI.DrawTexture (new Rect (0, 0, Screen.width, Screen.height), fadeOutTexture);
14.  
15.  
16.     }
17.  
18.     public float BeginFade(int direction){
19.    
20.         fadeDir = direction;
21.  
22.         return(fadeSpeed);
23.  
24.     }

It works great on PC but on 3DS hardware doesn't do anything and i believe it's related to the alpha or something becuase all the animation that i made using unity's sprite renderer color don't work neither! and they were fadings as well...

If a N3DS developer could give me a hint of why this is happen would be great 'cause like a said before nintendo forums are ghost towns...​