KV White screen of death?

While following a guide to dual boot into android (this guide: https://xdaforums.com/t/guide-instal...4450117/page-4) I seem to have screwed up. My kindle voyage is stuck on a white screen with the backlight on. It just blinks occasionally and I can't also get windows to see it anymore. I have no idea what the next step would be to fixing it if I can. Can anyone here help me troubleshoot? I've tried both waiting for it to die and unplugging the battery but it always boots back into the white screen.