Thank you! That was by far the easiest dashboard update I've ever done. Ultra Street Fighter IV is now working. Avatars look fine. Setting up dashlaunch to auto-load aurora wont be a problem. I am, however, still getting the E71 error if i boot with no hard drive.
Simple 360 NAND Flasher, like the update you just described, reboots the 360 automatically after flashing, so no, I didn't shut it down and unplug it the first time. I did unplug everything after restoring the backup through xell, but still got E71. Can this be fixed?