removeAndUnload() the texture, then reload the texture, the obj seems still rendering with the dummy texture:
car.setTexture("car");
TextureManager.getInstance().removeAndUnload("car", getFrameBuffer());
Texture t = new Texture(in, false);
TextureManager.getInstance().addTexture("car", t);
TextureManager.getInstance().prewarm(getFrameBuffer());
car.setTexture("car");
And if i don't remveAndUnload, just replace it, the result is correct.