You don't have to have a bios, it's optional. You can get a Wii U homebrew app that lets you go directly to HBC in vWii to access Nintendont that way. You just have to make sure you have a second apps folder on the root of your sd card with the latest Nintendont app in its own folder in it. You need a games folder on your root also that has your gamecube iso renamed game.iso. Boot into the Wii U Homebrew Launcher and launch the hbl2hbc app. Then once in the HBC, load nintendont. Select sd, then enter settings(B button I believe). Enable, at the very least, MemCard Emulation and Wii U widescreen. Next boot up your iso. You have to boot up the iso to save the settings. This should create the nincfg.bin file on the root of your sd card. This could help, but I know a lot of people, including myself, have had this issue and the devs can't replicate it and they can't fix what they can't replicate. Also, I've once read in the Nintendont thread, Nintendont is finicky about certain sd cards. What kind of sd card do you have?
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I'm using a Toshiba SDHC 4 GB card, the ones that were bundled with o3DS XLs.
yes you cant run autobooter until you boot nintendont atleast once from noone autoboot version,since you lack a ninconfig.bin on sd card download this rar and grab the ninconfig only and put it on the root of your sd card the rest dont use thme they are old.
I added the file you provided, still the same black screen.
I'm going to try to run a HBC forwarder and go straight to Nintendont and try to boot the game from there and see if that helps