Reply to Might have ruined firmware!

I might have ruined my firmware... I got to the step where you remove the cable harness and continued until i pressed program flash and everything worked fine. I believe i got confused on the last steps. After everything was complete, to see if the computer would recognise the vci with the new upgrade, I assembled it back together and plugged in and powered on my vci to the computer. The computer wouldnt even recognise the usb and no lights turned on! So i took it apart again and tried downloading the firmware with 2 cables attached and my chip still installed because i was somewhat deceived by that part of the video, This never worked either, I enterchanged both ways of installing the update numerous times with both one and two cables attached whiile the back plate of the vci was opened and got farther bad results. Im not sure if im missing something small on the very last step or if i completely ruined my firmware ?? Im am also believeing that maybe my usb connection for my vci wasnt even working during the firmware update process??? Ean do you have any idea of what im doing or did wrong???