Download 6 textures from the web, create a cubemap and set it as skybox in runtime

In my app I need teh user to be able to download already prepared 360 photos, cut into 6 pieces. After that, the cubemap must be made, and loaded as a skybox, so that the user could explore 360 degrees photos on his mobile device.

I've been stuck here for almost a week, but nothing worked for different reasons, finally I've ended up with something that doesn't throw exceptions, but still it sets an emty gray skybox in the end.

Option 1: HttpWebRespone

     public Material second;
 private Cubemap c; 
     public void SetSkybox()
         {
     c = new Cubemap (1024, TextureFormat.RGB24, false);
     PhotoRequest("front", CubemapFace.PositiveZ);
     PhotoRequest ("back", CubemapFace.NegativeZ);
     PhotoRequest ("top", CubemapFace.PositiveY);
     PhotoRequest ("bottom", CubemapFace.NegativeY);
     PhotoRequest ("right", CubemapFace.PositiveX);
     PhotoRequest ("left", CubemapFace.NegativeX);

     c.Apply ();
     Material mat = new Material (second);
     mat.SetTexture ("_Cube", c);
     RenderSettings.skybox = mat;
 }

     private void PhotoRequest(string filename, CubemapFace cmf)
 {
     ServicePointManager.ServerCertificateValidationCallback = SkyboxAuthentication.Validator; // I know, it's bad
     string url = {path to the webfolder with the photos};
     string completeURL = url + filename;
     var request = (HttpWebRequest)WebRequest.Create (completeURL);
     var response = (HttpWebResponse)request.GetResponse ();
     Stream dataStream = response.GetResponseStream ();
     BinaryReader reader = new BinaryReader (dataStream);
     byte[] responseFromServer = ReadAllBytes(reader);
     Texture2D tex = new Texture2D (1920, 1920);
     tex.LoadImage (responseFromServer);
     Color[] colors = tex.GetPixels ();
     c.SetPixels (colors, cmf);
     reader.Close ();
     response.Close ();
 }

 byte[] ReadAllBytes(BinaryReader rdr)
 {
     const int bufferSize = 1024;
     using (var ms = new MemoryStream()) {
         byte[] buffer = new byte[bufferSize];
         int count;
         while ((count = rdr.Read (buffer, 0, buffer.Length)) != 0) {
             ms.Write (buffer, 0, count);
         }
         return ms.ToArray ();
     }
 }

Option 2: WWW

     bool front = false;
     bool back = false;
     bool top = false;
     bool bottom = false;
     bool right = false;
     bool left = false;
 public void SecondSkybox()
     {
         c = new Cubemap (1024, TextureFormat.RGB24, false);
         StartCoroutine(PhotoRequest ("front", CubemapFace.PositiveZ));
         StartCoroutine(PhotoRequest ("back", CubemapFace.NegativeZ));
         StartCoroutine(PhotoRequest ("top", CubemapFace.PositiveY));
         StartCoroutine(PhotoRequest ("bottom", CubemapFace.NegativeY));
         StartCoroutine(PhotoRequest ("right", CubemapFace.PositiveX));
         StartCoroutine(PhotoRequest ("left", CubemapFace.NegativeX));
         StartCoroutine (DoLast ());
 
         c.Apply ();
         Material mat = new Material (second);
         mat.SetTexture ("_Cube", c);
         RenderSettings.skybox = mat;
     }

 private IEnumerator PhotoRequest(string filename, CubemapFace cmf)
     {
         switch (filename) {
         case "front":
             front = true;
             break;
         case "back":
             back = true;
             break;
         case "top":
             top = true;
             break;
         case "bottom":
             bottom = true;
             break;
         case "right":
             right = true;
             break;
         case "left":
             left = true;
             break;
         }
 
         string url = {path to the webfolder with the photos};
         WWW www = new WWW (url + filename);
         yield return www;
         Debug.Log (www.responseHeaders["STATUS"].ToString());
         Color[] colors = www.texture.GetPixels();
         c.SetPixels (colors, cmf);
 
         switch (filename) {
         case "front":
             front = false;
             break;
         case "back":
             back = false;
             break;
         case "top":
             top = false;
             break;
         case "bottom":
             bottom = false;
             break;
         case "right":
             right = false;
             break;
         case "left":
             left = false;
             break;
         }
     }
 
     private IEnumerator DoLast()
     {
         while (front || back || top || bottom || right || left) {
             yield return new WaitForSeconds (0.1f);
         }
     }