alright so i got my unit to finally work and i tried to do the update. half way through the update it stopped working. i tried to restart the unit, tried to reset and also do the reset+eject+menu+map and nothing works. the fan starts up but nothing shows on the screen. the lights on the buttons dont even light up. plz someone help if you can. i tried searching for this but i didnt find anyone with the same problem. i have the f700bt and was trying to update to 2.8