The cIOS (custom IOS) is a custom piece of software that is used by some applications that work with unofficial content.
By installing it, you can for example use Backup Loaders and install unofficial channels to your Wii menu.
Every cIOS uses an official IOS by Nintendo as its base.
While a cIOS is installed by most people for Backup Loaders, it is also needed by a handful of other applications to work.
There are many applications however that don't need a cIOS.
Most of the Homebrew Applications on Wiibrew only need the Homebrew Channel.
Offline NUS Downloads
If you have no WiFi access on your Wii, follow these additional steps first. Else skip to the guide below.
The WiiU uses another method to get these WADs, so if you are softmodding a WiiU (vWii), you should skip these steps regardless.
1. Start up NUS Downloader. If you don't have it, you can grab it on its page (or direct download link)
2. Make sure that "Pack WAD" is enabled.
3. Using the database, navigate to the following files and press start NUS Download for each one:
4. Open the NUS Downloader directory (the folder where you placed NUS Downloader, you can use extras -> open NUSD directory to open it easily).
You will see a folder named titles. You will find two new folders in this directory:
Copy both WAD files to the root of the SD card.
1. Start off by downloading the cIOS Installer (make sure to download the correct one):
Inside the zip will be an apps folder. Extract this folder to your SD card (merge with existing apps folder if needed).
Your SD card should look like this:
2. Insert you SD card into the Wii.
Start it up and go to the Homebrew Channel.
Now locate the d2x cIOS installer and run it.
3. Wait for the app to load. Read the text on the welcome screen (if it interests you) and press A to continue.
4. You will now see the main configuration screen.
There are many different configurations you can make when installing cIOSs. This guide merely shows our own recommendations, based on the experience of the general community. They should work fine for 99% of all cases.
This guide will install the following cIOSs:
How to install (don't press A unless told!):
You are now ready to install, so press A to continue. You will land on an overview with the available cIOS slots.
The slot you just selected should be blinking. Several other slots may be highlighted in red or purple, depending on your console and possible previous softmods.
This page may be skipped on the WiiU installer.
Press A to start the installation.
Wait for the progress to complete. It may take a while, especially for the online installation.
Once it finishes, you will land on another IOS overview screen.
Your freshly installed cIOS should be highlighted in a green color.
On the WiiU version, you will get a simple confirmation message instead.
Press the A button to go back to the configuration screen.
Next, you want to configure the second cIOS. This time, use the following settings:
Again, press A to install it and wait for the process to finish.
Once everything is installed, press B to exit the application.
You are now able to run any backup loader you want! Enjoy!
We recommend you to use a USB loader.
USB loaders do not require DVD burning and have much better speeds and interfaces.
Do I need to install anything before doing this?
When should I follow the steps under "Offline NUS Downloads"?
Can I use other cIOS configurations as the one in this guide?
What is NAND Emulation?
What is the "Current IOS" listed on the bottom of the installer?
Do I need to install a cIOS to use Nintendont (GameCube Backup Loader)?
Backup Launchers >