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I own a JTV69US. I love this guitar but this monkey-business is ridiculous. I have version 1.82b. Using the supplied cable and tried a standard CAT5 cable. My guitar is plugged in. My volume is turned up. I'm USB plugged into the back of my Mac, not a hub or keyboard. Everytime I try to upgrade or rollback the flash I get the error message ... "Update Failed. (Code 80009000) Unknown MIDI Error. Make sure the cables are connected and try the update again." I've tried it 3 or 4 hundred times. Same error message. I own a 600 and 700 and have connected them many times (though there are usually some issues.) I've never been able to connect my JTV. HELP!