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Are you able to reboot your laptop and go in to the bios? Might have to hit the DEL or F2 key (should tell you which). If so look around to menus for something like USB Legacy Support. If it is on, turn it off, if it is off turn it on.
Unfortunately, other than finding a usb 1.1 hub like Dave_S and testing that, changing the USB Legacy Support in your bios is the only other suggestion I can make given all the other tests you have done.
Could always flash with the new firmware and give it a shot (I know you reflashed with the older version)
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