Cboot2 loading with failed to load IOS suggests your nand is corrupted beyond use. You should be able to load bootmii to fix it. Bootmii in boot2 is working as cboot2 is loading. Just need to get it to load the restormii file from bootmii on the sd card. Format the sd card with the panasonic sd card formater. Extract this to sd:\ bootmii.zip
Lets see how that goes.