I too thought it would be in failsafe mode, as the flash didn't even complete the first line before the cmd window crashed.
One of the problems is that the bios will not detect the device, so just using dvrflash reports no dvr device. In dos, if I try to load the aspi driver, no device is found, so dvrflash won't do anything.
What I thought I would try is hot-swapping. The idea is that I would connect another cd-type drive on say the secondary channel and then boot the machine. Then load the aspi driver and find out its target id. Disconnect the power cable and ide cable and reconnect to the dvr. Then try a forced flash to the scsi id. I think it would be best to use another dvr of the same type, but if it is going to work anything should really do. I'll be well impressed if the drive is resurrected .
I'll probably leave it until next week and wait for the rpc1.org sites to be back up and get a fresh set of everything, as I don't want to use any of the files from the machine that caused the crash.