For some reason, for some people, having a Gamecube adapter plugged in makes Gamecube games freeze when you start them. I don't know why. I use wii USB helper to inject games, that way I can play gamecube games on my gamepad at NATIVE resolution on a native res display if I feel like it or swap back. I have a few roms for. Wii U + HDMI + WiiVC injects = Super crisp Gamecube and Wii games! Most of you may already know this. But I just wanted to mention it anyway, for those who may not know. I have a Samsung 55 inch 4K TV. Step 1: Pick a Rom. When you pick which rom to inject into a base WAD, make sure your rom is the same size as the rom in the base WAD (i.e. Super Mario World is 512kb, so inject a game that is also 512kb). Note that most N64 games (all made by Rare) will not work if injected, so stick with every other console.

Note: I have to use 2 separate USB drives for games. 1 for Wii U titles, 1 for Wii/GC titles. Also, you can not have 2 hard drives plugged into the Wii U at the same time, so you need to switch if you want Wii U/GC. It was convenient though to use the same drive I had used on my hacked Wii.

Last update: 10/30/20

IMPORTANT: Blocking updates

Set your console's DNS to 168.235.092.108 (US) and 081.004.127.020 (EU) (use both) to block the console from downloading updates.

Settings > System Settings > Internet > Connect to the Internet > Select your connection > Change settings > DNS (Don't auto-obtain)

If you don't do this, you allow Nintendo to update your console without asking. In the absolute worst case this can brick your Wii U.

If you want to block system updates without a custom DNS, use this method.

Guides

Wii Vc Inject Gamecube Download

START HERE: Haxchi/Mocha guide: https://wiiu.hacks.guide/#/cfw-choice

Alternative guide 2 (in case the other two are unavailable)

Piracy

Brazilian Title Install Method

recommended, installs 'legit' games to your HDD

Follow this guide (backup)
- Note: uTikDownloader was discontinued, use a different tool like Wii U USB Helper or NUSpli instead.
Titlekey database: https://titlekeys.ovh/

Loadiine

not recommended, long loading times, no online, incompatible with some games

Wii Vc Injector Gamecube

Follow this guide
Loadiine works on 5.5.x and doesn't require the browser method if you have Haxchi installed.

Useful Tools

Wii U USB Helper: extremely bloated GUI for downloading games directly from Nintendo's CDN, has tons of other features as well
NUSGrabberGUI: another tool for downloading games, not as cluttered but also not as convenient
NUSspli: a freeShop solution for Wii U - download and install titles directly through your console - significantly lower download speeds than the PC tools
NUSPacker: packs decrypted files into installable packages, useful for modding games)
Dumping disc-based games for installation: https://github.com/koolkdev/disc2app/releases (guide
Modding vWii (the Wii inside your Wii U): https://wiiu.hacks.guide/#/vwii-modding
Inject Wii/GameCube games via Virtual Console: https://gbatemp.net/threads/release-wiivc-injector-script-gc-wii-homebrew-support.483577/
Inject (S)NES/DS/N64/GBA and more games via VC: https://gbatemp.net/threads/release-ultimate-vc-injector-for-wiiu.486781/
ftpiiu (Wii U FTP server)
HID to VPAD (use HID controllers such as Dualshock 3/4, KB+M)
- Xinput and Bluetooth controller support: https://github.com/Maschell/HIDtoVPADNetworkClient
SaveMii (offline save manager)
SwapDRC (play TV-only games on the gamepad)

Wii U common key: d7b00402659ba2abd2cb0db27fa2b656

FAQ

Can I update to 5.5.x (current OFW)?

Updating to the newest firmware is perfectly safe. However, if you're not using Haxchi and want to keep the old browser exploit which is said to be more reliable, you may want to take a look at this guide.

Can I use DLCs and play online?

Generally, yes, but keep in mind that you will need to boot into CFW in order to play DLC and eShop-only games. If you're using Loadiine, there's no guarantee whether you'll get either to work. Consider switching to the Brazilian method.

Wii Vc Inject Gamecube Games

How do I decrypt games for use with Loadiine/CEMU?

There's a small tool called 'cdecrypt' you can use for that. Some NUS downloaders like JNUSTool already come with it, but a bit of googling around should do the job too.

How can I get VC games to show up in Loadiine?

Just stop using Loadiine.

Notes on NUSspli

Wii U Vc Injector Gamecube

NUSspli generates a fake ticket and downloads directly from the eShop to your Wii U. You require an SD card. The app updates automatically. There are known bugs like sometimes you can't directly install the game while you download it (it would ask you to update your Homebrew Launcher even though you have the latest version), so you have to choose 'download to SD' and then install it with WUP GX to nand or USB
All games downloaded via NUSspli require the use of CFW to launch, this is because it's not using a legit ticket but a fake one generated through Nintendo's own ticket generation algorithm
The download speeds are bad, really, really bad, so if you got no other way to download your games, turn off power save mode from your Wii U's settings so it doesn't shutdown automatically after a while. If a download stops, just press Y after 30 seconds. You can leave the app in the middle of a download and resume it later.

Wii Vc Inject Gamecube Rom

Other stuff

If you're having trouble getting an external HDD to work on your Wii U, make sure it's connected via a Y-cable, since the Wii U doesn't supply it with enough power otherwise which can lead to crashes.
In DS Virtual console games, you can change the internal resolution to X2 by editing the /game/content/configuration_cafe.json file. Search for 'Renderscale', it should display a 1. Switch it to 2.

Wii Vc Inject Gamecue