Restoring to stock firmware: am I bricked?

Hello. I was preparing to sell my Chromebook, with one step I had to take being restoring it to stock conditions, since I had installed Windows. I flashed my firmware backup, which was successful. I rebooted, greeted by the dev mode warning (this time with terminal looking text, weirdly enough), but I made the mistake of simply disabling dev mode without taking any other steps, and now I cannot get the unit to boot. The display backlight doesn’t even turn on, and the only sign of life is the power light on the side of the machine. I would like to know, is it cooked?