OK, so I had Cacko 1.21B running and decided to go back to the Sharp ROM that came on my C-860. I made a NAND backup of the Cacko and grabbed my NAND backup of the original Sharp ROM (138,543,120 bytes). Both the backup of Cacko and the restore of the Sharp went fine (at least according to the green lines). After the Sharp NAND was done, I selected reboot from the menu and it went blank, never rebooted. When I power it up now, both the yellow light and the green light blink on and off, but it never reboots.
I can't get back into the Service menus anymore to try and "re-restore" either of the NAND backups. It's not dead though, I can get to the Flashmenu. However, if I tell it to reflash either the Sharp ROM or the Cacko, it just goes blank and nothing happens. If I try and boot to a different Runlevel, same thing, lights flash on and off, nothing reboots. I've tried various combinations of turning things on, letting it sit for a minute or two with no battery. No soap, still does nuttin'.
I'd be happy to get either of the two roms running again if you experts out there would care to offer some suggestions.