So, I made my own splash screen just using photoshop. I have an avic 940bt head unit and I just had to make sure I sized the image to be 500x240 or 1000x480 and save it into a folder named "pictures" on a micro sd card. If it is anywhere other than a folder named pictures on the root level the pioneer won't see it. That said, I am unfamiliar with your head unit but I would be more than happy to do a little research on it. I can definitely say that the bypass wouldn't be needed just for a custom splash screen though. So stay tuned and I will let you know what I find out.
