Hello, I followed the instructions from "https://forums.macrumors.com/threads/adding-usb3-0-to-late-2009-imac-11-1.1979806/#post-26064070" which were limited but gave me a lot of hope. But, after doing it all I find myself with 2 more USB 2 ports. Basically the system identifies a USB 3 Superspeed Bus and a USB 3.0 High Speed Bus. But, when I connect drives to the new ports they only load on the USB 3.0 High Speed Bus. I am using the moded AppleUSBXHCI. FWIW all the info listed under the 2 buses is identical in the system information windows. Same PCI dev ID, rev ID, vendor ID, and bus number. Installed kexts and setting dev mode to 1 was all new stuff to me. I tried the Generic USBXHCI but same results. Anyone have thoughts?