I dont have a WOZ, but i know computers. Sounds like it installed the OS back onto the USB. I would start over with a clean ISO boot USB and also check the cables on the hard drive. Unplug and re-plug in the hard drive cables both at the hard drive and where it plugs into the board. I would actually try to get the system to find the hard drive first before upgrading. Hope this helps and you get it figured out.