Ok, I have a CyberPower CP-H420MP USB Hub which is self-powered through batteries. After reading many posts, it seems as this should work with the 770 in host mode because it provides power. Now, I connected it with a gender changer to my 770, yet my 770 is not seeing it. I read some more posts that said I need to buy this cable:

http://www.xpcgear.com/usbtype2atob.html

which brings power to the host. Now what's the point of a self-powered USB Hub if I need to do that?

Do I still need that cable in addition to my USB Self-Powered Hub? I also read that I can hack my Hub or Cable to do the same thing as that cable does. Can anyone please explain how I would do this? I was under the impression that it would work without that special cable......

Thanks