Honestly I have no idea. but that looks like it has at least come to life.
I thought that meant the fastboot via usb interface is now active isn't it?
connect cable. access that way? No?
AFAIK that's the message that pops up when the fastboot mode activates. Which should mean you can now push fastboot instructions to it.
I thought it would expect those instructions via USB at this point. I could WELL be wrong. just my guess