I am new to Wii U hacking, but I think ketter bomb doesn't work for vWii. Be careful, do not use the samefiles you used for the Wii on the VWii, you may brick you Wii U.
Have a look here
https://gbatemp.net/threads/beginners-guide-launch-hacks-game-backups-and-homebrews-on-wiiu-vwii.388448/...