I used the wrong key# when attempting to install firmware upgrade to BCD396T. Scanner is either disabled or the memory has been completely erased. At power-up, all I get is a blank display and flashing backlight. My computer cannot comunicate with my scanner. I had this thread posted on another forum and received a couple of suggestion to try. I have tried re-installing the upgrade several times, no luck. I have tried holding the HOLD, 2 and 6 buttons down while pressing the power button on, no luck, still just a flashing display. Any suggestions will be welcome, thank you.